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JEE Main Physics question

PhysicsMotion in a Straight LineJEE Main

A ball is projected vertically down with an initial velocity from a height of 20 m onto a horizontal floor. During the impact it loses 50% of its energy and rebounds to the same height. The initial velocity of its projection is

Answer: (A)

Solution

Let the ball be projected downward with speed v from height h = 20 m. Total mechanical energy at the point of projection is ½mv² + mgh. After losing 50% of this energy on impact, the

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Question ID VK-154015