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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A small block of mass moves with velocity 5 ms⁻¹ towards another block of the same mass , placed at rest at a distance of 2 m on a rough horizontal surface. The coefficient of friction between the block and ground is 0.25. Collision between the two blocks is elastic. The separation between the blocks, when both of them come to rest (g=10 ms⁻²), is

Answer: (A)

Solution

Deceleration due to friction . The first block decelerates over the 2 m gap: just before collision. In an elastic collision between equal masses, velocities are exchanged: the struck

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Question ID VK-158641