Answer: A 2140 kg railroad flatcar, which can move with
Chapter , Problem 106(choose chapter or problem)
A 2140 kg railroad flatcar, which can move with negligible friction, is motionless next to a platform. A 242 kg sumo wrestler runs at 5.3 mls along the platform (parallel to the track) and then jumps onto the flatcar. What is the speed of the flatcar if he then (a) stands on it, (b) runs at 5.3 mls relative to it in his original direction, and (c) turns and runs at 5.3 mls relative to the flatcar opposite his original direction?
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