JEE Main 2013 Physics 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: (4)
Solution
No external horizontal force, so the centre of mass stays fixed. If the boy moves x towards the wall and the cart moves y away,
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