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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A bullet of mass 0.01 kg, travelling at a speed of 500 ms⁻¹, strikes a block of mass 2 kg, which is suspended by a string of length 5 m, and emerges out the other side. The centre of gravity of the block is found to rise a vertical distance of 0.1 m. What is the speed of the bullet after it emerges from the block?

Answer: (B)

Solution

Block's speed after being hit: ms⁻¹. Momentum conservation:

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Question ID VK-158681