Looking For Express Boxcar ? Then This is Where You Want to Be
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 Lot of 4 Walthers Athearn Roundhouse Train Model 50 Express Reefer Truss Boxcar $9.99 Time Remaining: 6h 8m |
 Lot of 4 Athearn Train Models 40 Boxcar Canadian National Express Ice Reefer $9.99 Time Remaining: 6h 35m |
 Jonn Deere Creek Express Box Car by The Bradford Exchange $69.00 Time Remaining: 10h 54m Buy It Now for only: $69.00 |
 K LINE O 761 1372 THE MILWAUKEE ROAD EXPRESS SERVICE BOXCAR $26.00 (12 Bids) Time Remaining: 12h 39m |
 Atlas Fruit Growers Express Model Railroad Box Car $9.99 Time Remaining: 12h 59m |
 Pacific Fruit Express Model Railroad Box Car $9.99 Time Remaining: 13h 10m |
 Accurail HO Scale Western Fruit Express Refrigerated Box Car 49320 $3.75 (4 Bids) Time Remaining: 13h 14m |
 Athearn N Scale Fruit Growers Express Refrigerated Box Car $0.99 (1 Bid) Time Remaining: 13h 20m |
 27250 CANADIAN NATIONAL EXPRESS BOXCAR $58.95 Time Remaining: 13h 21m Buy It Now for only: $58.95 |
 Fruit Growers Express PRR 91904 50 FGE Boxcar Atlas 33701 N scale MY1730 $8.95 Time Remaining: 13h 32m |
 N MTL 32090 50 plug door boxcar BREX Burlington Refrigerator Express NIB $0.99 (1 Bid) Time Remaining: 14h 18m |
 N MTL 038 00 162 50 boxcar BN WFE Burlington Northern Western Fruit Express $3.05 (2 Bids) Time Remaining: 14h 22m |
 AccuReady 93103 HO Scale Fruit Growers Express 40 Plug Box Car $10.95 Time Remaining: 15h 32m Buy It Now for only: $10.95 |
 K Line 3 Vintage NYC Cars Reefers 7506 6078 + Express Box Car 9239 C4 Project $19.99 (2 Bids) Time Remaining: 1d 2h 55m |
 MTL Special Run 40 Boxcar NMRA Express Service 2035 $15.90 Time Remaining: 1d 5h 16m Buy It Now for only: $15.90 |
 1977 Lionel 6 9660 Walt Disneys Mickey Mouse Express Box Car L0922L $57.00 Time Remaining: 1d 5h 27m Buy It Now for only: $57.00 |
 LIFE LIKE HO SCALE SWIFT LIVESTOCK EXPRESS SLXS 7221 WOODEN BOXCAR NM $4.99 Time Remaining: 1d 5h 39m Buy It Now for only: $4.99 |
 WEAVER TRAINS NO 2549 PS 1 PRR EXPRESS BOX CAR VERY NIC E $27.95 Time Remaining: 1d 7h 35m Buy It Now for only: $27.95 |
 NYC EXPRESS BOX CAR 1948 NEW YORK CENTRAL 20th CENTURY COLORS RTR HO Scale $34.95 Time Remaining: 1d 10h 30m Buy It Now for only: $34.95 |
 Lionel 27251 WP EXPRESS BOXCAR $55.00 Time Remaining: 1d 11h 16m |
 Athearn JMC HO Box Car CBQ BREX Express 79513 Model 1015 $9.99 (1 Bid) Time Remaining: 1d 13h 32m |
 Burlington Refrigerator Express 40 Boxcar $3.99 Time Remaining: 1d 13h 52m |
 MDC Roundhouse HO Special Edition CBQ Express Box Car 79544 Model 68 $9.99 Time Remaining: 1d 13h 59m |
 MDC Roundhouse HO Special Edition CBQ Express Box Car 79517 Model 68 $9.99 Time Remaining: 1d 14h 2m |
 PSC brass Burlington express box car ex troop car 8689 Precision Scale Co $375.00 Time Remaining: 1d 14h 13m Buy It Now for only: $375.00 |
 Harley Davidson TRAIN BOXCAR NORTH POLE EXPRESS CHRISTMAS ORNAMENT 2002 IN BOX $59.95 Time Remaining: 1d 15h 12m Buy It Now for only: $59.95 |
 HO Bachmann Shell tanker Mantua Cattle Car Pacif Fruit Express Box car Used $25.00 Time Remaining: 1d 17h 19m |
 O DECALS UP YELLOW 40 EXPRESS BOXCAR c1952 MICROSCALE NIP $4.99 Time Remaining: 1d 23h 54m Buy It Now for only: $4.99 |
 HO Bachmann USAF Missle Car + 2 LifeLike Thrall box cars 1 REA Express reefer $39.99 Time Remaining: 2d 2h 20m Buy It Now for only: $39.99 |
 N SCALE ATLAS 33664 50 FRUIT GROWERS EXPRESS BOXCAR NORFOLK WESTERN 296842 $6.99 Time Remaining: 2d 3h 44m |
 N SCALE ATLAS 33614 50 FRUIT GROWERS EXPRESS BOXCAR CNW 33234 $6.99 (1 Bid) Time Remaining: 2d 3h 46m |
 HO BURLINGTON NORTHERN FRUIT EXPRESS 40 STEEL PLUG DOOR BOXCAR RBWX 64040 LOT C $10.16 Time Remaining: 2d 4h 36m Buy It Now for only: $10.16 |
 Lionel 16237 Railway Express Agency Boxcar 1992 $29.95 Time Remaining: 2d 7h 10m Buy It Now for only: $29.95 |
 Varney Wooden Pacific Fruit Express 51847 Box Car HO Scale Used Sprung Trucks $0.99 Time Remaining: 2d 7h 15m |
 Lionel Pennsylvania Express PS 1 Boxcar $59.99 Time Remaining: 2d 8h 5m Buy It Now for only: $59.99 |
 Lionel 6 27249 Great Northern Express Boxcar $34.99 Time Remaining: 2d 8h 7m Buy It Now for only: $34.99 |
 VINTAGE ATHEARN PACIFIC FRUIT EXPRESS 45698 HO SCALE BOX CAR $4.99 Time Remaining: 2d 9h 34m |
 HO Athearn RI Rock Island 40 Express Box car 20061 $24.95 Time Remaining: 2d 10h 13m Buy It Now for only: $24.95 |
 Walthers HO Scale 60 Express Box Car Amtrak Phase V WA 932 6045 $26.20 Time Remaining: 2d 10h 52m Buy It Now for only: $26.20 |
 OS AMTRACK HI SPEED EXPRESS MAIL BOXCAR 1514 1991 RAILROAD SLIDE $2.99 Time Remaining: 2d 11h 17m |
 HHO SCALE CON COR 60 FT EXPRESS BOXCAR NEW YORK CENTRAK BOXCAR KIT $9.90 Time Remaining: 2d 11h 23m Buy It Now for only: $9.90 |
 Athearn Special Edition Rock Island RI 40 Express Box Car Set $24.99 Time Remaining: 2d 11h 45m |
 Athearn Pacific Fruit Express X602 Box car HO Scale New in Box Kadee Couplers $0.99 Time Remaining: 2d 12h 2m |
 N Scale AHM Weathered Fruit Growers Express Boxcar FDEX 9253 $9.99 Time Remaining: 2d 12h 40m Buy It Now for only: $9.99 |
 Walthers Gold Line Rock Island Express Boxcar Product 932 4164 HO Scale $9.99 (1 Bid) Time Remaining: 2d 12h 42m |
 Hawthorne Village TrainJohn WayneThe Duke ExpressLegend Box CarMIB $29.99 Time Remaining: 2d 13h 22m |
 Weaver 175277 Pennsylvania Railway Express Agency Green Box Car PRR O Scale $19.95 Time Remaining: 2d 13h 26m |
 HO trains lot of 2 Box Cars 50 ft RI State Mainstreet Express $5.99 Time Remaining: 2d 13h 33m |
 MTH Railking Christmas Express Passenger cars and box car $109.99 (1 Bid) Time Remaining: 2d 14h 57m |
 Vintage 1988 Playskool Express Train Replacement Box Car All 3 Boxes Crates $12.99 Time Remaining: 2d 15h 23m Buy It Now for only: $12.99 |
 BM Constitution Express Boxcar 77039 8x12 color $6.95 Time Remaining: 3d 2h 14m Buy It Now for only: $6.95 |
 N Scale Fruit Growers Express Box Car seen in Photo $0.99 Time Remaining: 3d 2h 20m |
 Walthers 50 Insulated Box Car Fruit Growers Express 933 6877 FGE SAL New in Box $5.99 Time Remaining: 3d 6h 4m |
 Details West HO BC711 Fruit Growers Express 50 Insulated Box Car Kit $14.00 Time Remaining: 3d 6h 5m Buy It Now for only: $14.00 |
 FOX VALLEY Baltimore Ohio C 16 Express Green 40 Wagontop Box Car 1909 $28.99 Time Remaining: 3d 7h 42m Buy It Now for only: $28.99 |
 NIB O Weaver EBC72LD Express Boxcar Lackawanna 8621 $41.49 Time Remaining: 3d 7h 46m Buy It Now for only: $41.49 |
 38160 N MTL Micro Trains BN Western Fruit Express Boxcar 745461 NIB WPT $15.95 Time Remaining: 3d 11h 40m Buy It Now for only: $15.95 |
 Canadian National Express Boxcar $64.99 Time Remaining: 3d 11h 49m Buy It Now for only: $64.99 |
 1987 Lionel ME 1987 Mopar Express Box Car L0975L $97.00 Time Remaining: 3d 12h 2m Buy It Now for only: $97.00 |
 Vintage New Bright Caboose Boxcar DW RR Denver Express Rolling Stock $3.99 Time Remaining: 3d 12h 34m |
 O O27 Scale Box Car Pacific Fruit Express Lot BG588 $0.99 Time Remaining: 3d 12h 48m |
 HAWTHORNE VILLAGE TRAINSILVER MOON EXPRESSBOX CARNEW IN BOX $32.95 Time Remaining: 3d 13h 17m Buy It Now for only: $32.95 |
 REDBALL BRASS SIDED NYC EXPRESS BOXCAR $17.99 Time Remaining: 3d 13h 31m |
 HO Athearn 50 Express Box Car Canadian National Railroad NIB $11.00 Time Remaining: 3d 13h 47m Buy It Now for only: $11.00 |
 Lot of TWO Micro Trains NMRA Special Run Express Service Boxcars w KD $15.00 Time Remaining: 3d 13h 56m |
 Micro Trains NMRA Special Run Express Service 40 Boxcar w KD $7.00 Time Remaining: 3d 13h 58m |
 Micro Trains NMRA Special Run Express Service 40 Boxcar $5.00 Time Remaining: 3d 13h 59m |
 Lionel 6050 SWIFT refrigerator Express Box Car $6.95 Time Remaining: 3d 14h 1m |
 LIONEL TRAINS NEW SOUTHERN FRUIT GROWERS EXPRESS FARR BOXCAR NO RESERVE OB $7.50 (4 Bids) Time Remaining: 3d 14h 21m |
 Pennsylvania Railway Express Agency REA Boxcar 5769FREE SHIPPINGLNIB $34.00 Time Remaining: 3d 14h 26m Buy It Now for only: $38.00 |
 DTD N SCALE MTL 102060 1998 HOLIDAY 60 BOX CAR SNOWBALL EXPRESS MICRO TRAINS $9.99 (1 Bid) Time Remaining: 3d 14h 32m |
 Branchline HO Blueprint Fruit Frowers Express 50 PD Boxcar 90226 $12.75 Time Remaining: 3d 14h 49m Buy It Now for only: $12.75 |
This is not homework.. What's the solution to this riddle?
Imagine 2 miniature boxcars on a frictionless track.
One car weighs 10# and is moving east at 4 mph..
The other weighs 6# and is moving west at 12 mph.
Disregarding friction,heat,compression and anything else that could get in the way of making this anything but a pure puzzle,
what happens when the 2 cars meet and couple.
HINT: momentum is defined as a body's mass times its velocity, which is expressed mv.
The conservation of momentum must always be maintained
this was in todays riddle section of our local paper
The 2coupled cars will move at 2 mph.
its based on momentum of 10# x 4(40#)
the 2nd car of 6# x12 (723)
When they couple they will 16# Since the respective momentum are in opposite directions, you have to subtract them 72-40=32#/mph
since the momentum is found by mv and we know the mass is 16#, the velocity will be 2mph (16# x2# =32#,/mph
So the conservation of momentum is maintained
AWESOME Lashup on BNSF Mixed Freight in Quincy, IL