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  4. A ball of mass 0.2 Kg falls under gravity from a height of 10 m with an initial velocity. It collides with the floor and looses 50 % of its energy and then rises back to the same height. The value of its initial velocity is

Q. A ball of mass falls under gravity from a height of with an initial velocity. It collides with the floor and looses of its energy and then rises back to the same height. The value of its initial velocity is

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Solution:

Total energy before collision = kinetic energy potential energy

After collision
Since the ball rebounds to a height



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