A 2150 kg railroad flatcar, which can move with negligible friction, is motionle

Question

A 2150 kg railroad flatcar, which can move with negligible friction, is motionless next to a platform. A 257 kg sumo wrestler runs at 5.3 m/s along the platform (parallel to the track) and then jumps onto the flatcar.
(a) What is the speed of the flatcar if he then stands on it?
m/s

(b) What is the speed of the flatcar if he then runs at 5.3 m/s relative to it in his original direction?
m/s

(c) What is the speed of the flatcar if he then turns and runs at 5.3 m/s relative to the flatcar opposite his original direction?
m/s

Explanation / Answer

a) 2140(0)+242(5.3)=(2140+242)v v=.538m/s b) its -a, or -.538m/s c) twice a, or 1.077m/s

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