Homework Help: physics

Posted by Anonymous on Thursday, March 11, 2010 at 10:46am.

A 12100 kg railroad car travels alone on a level frictionless track with a constant speed of 20.5 m/s. A 5850 kg load, initially at rest, is dropped onto the car. What will be the car's new speed?

physics - drwls, Thursday, March 11, 2010 at 11:41am
An application of the law of conservation of linear momentum, in the horizontal direction, will tell you the answer.

Give it a try.

Adding a load by dropping from above will not change the horizontal momentum.
physics - Wang, Tuesday, May 4, 2010 at 6:45pm
12100kg-5850kg=6250kg/100
1/2kv2

1/2(625)(20.5)^2=

131328.125m/s

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