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JEE Main Physics question

PhysicsMotion in a Straight LineJEE Main

A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 s, the average acceleration during contact is nearly (take ms)

Answer: (D)

Solution

Speed just before impact: ms downward. Speed just after rebound: ms upward. Taking up as positive: $Δ

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Question ID VK-152089