Conservation of momentum - Internal Motion Problem A man with a mass of 70 kg
is standing on the front end of a flat railroad car, which has a mass of 1,000 kg
and a length of 10 m
. The railroad car is initially at rest relative to the track. The man then walks from one end of the car t
to the other at a speed of 1.0 m/s
relative to the track. Assume there is no friction in the wheels of the railroad car. (a) What happens to the cart while the man is walking? (b) How fast does the cart move? (c) What happens when the man stops at the rear of the car?