Question

A child of mass "m" stands on a board of mass "M" which lies on a frictionless "Horizontal surface.The child starts walking with a speed " v" with respect to the ground.With what speed does the board recoil?
A)2mv/M^2
B)mv/M
C)V/M
D)V^2/M
E)2v/M

Answer 1

Hi , here is your answer !!

look at this attachment ;-


hope it help you !!


option number " B "

Answer 2

Your answer is the B option