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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A pulley fixed to the ceiling carries a string with blocks of mass m and 3m attached to its ends. The masses of the string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration?

Answer: (B)

Solution

a = (3m−m)g/(3m+m) = g/2 (magnitude; the 3m block accelerates down, the m block accelerates up, both at g/2).

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Question ID VK-153338