Posted by **John** on Friday, March 1, 2013 at 11:44pm.

train car with mass m1 = 521 kg is moving to the right with a speed of v1 = 7.9 m/s and collides with a second train car. The two cars latch together during the collision and then move off to the right at vf = 5.1 m/s.

1)What is the initial momentum of the first train car? I got 4115.9 kg m/s as the correct answer.

2)What is the mass of the second train car?

I don't know how to do the second question please help.

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