Question

A boy of mass 20 kg is standing on a 80 kg free to move long cart. there is negligible friction between cart and ground. initially, the boy is standing 25 m from a wall. if he walks 10 m on the cart towards the wall, then the final distance of the boy from the wall will be

Answer 1

The two blocks, m = 10 kg and M = 50 kg are free to move as shown. The coefficient of static friction between the blocks is 0.5 and there is no friction between M and the ground.