# A body is dropped from hundred metre high Building stripes the floor and looses 30% of its energy by how much will it bounce back

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by sidd4

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by sidd4

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= 100mg joule

kinetic energy = 0

total energy = 100 mg joule

now after striking with the floor, energy lost = 30% of 100mg

= 30mg joule

energy left = 70 mg

Let after impact it reaches a maximum height = H

At height H

KE = 0 (as velocity is 0 at maximum height)

now, potential energy = m×g×h = 70 mg

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