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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A steel ball of radius 2 cm is at rest on a frictionless surface. Another ball of radius 4 cm moving at a velocity of 81 cm/sec collides elastically with the first ball. After collision the smaller ball moves with speed of [RPMT 1999]

Answer: (C)

Solution

Since mass ∝ r³ (same density), the ratio of masses is (2/4)³ = 1/8; let m₁

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Question ID VK-154036