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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A man of mass stands at one end of a plank of length , which is at rest on a frictionless horizontal surface. The man walks to the other end of the plank. If the mass of the plank is , the distance that the man moves relative to the ground is

Answer: (B)

Solution

With no external horizontal force, the centre of mass stays fixed. If the man moves a distance and the plank moves (in opposite directions,

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Question ID VK-158593