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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A solid disc of mass M is just held in the air, horizontally, by throwing 40 stones per second vertically upward to strike the disc, each with a velocity of 6 ms⁻¹. If the mass of each stone is 0.05 kg, what is the mass of the disc? (g = 10 ms⁻²)

Answer: (A)

Solution

Each stone transfers its full momentum on striking the disc (and falls away): Δp per stone = mv = 0.05 × 6 = 0.3 kg·ms⁻¹.

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Question ID VK-153184