If a rubber ball falls from a height h and rebounds upto the height of h/2. The percentage loss of total energy of the initial system as well as velocity ball before it strikes the ground, respectively, are:
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Question

If a rubber ball falls from a height h and rebounds upto the height of h/2. The percentage loss of total energy of the initial system as well as velocity ball before it strikes the ground, respectively, are:

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G1 Physics · Accepted Answer

Velocity just before striking the ground: v = √(2gh) Initial mechanical energy: Eᵢ = mgh After rebound, maximum height is h/2. Final mechanical energy: E(final) = mg(h/2) Energy lost: ΔE = mgh - mgh/2 = mgh/2 Percentage loss: (ΔE/Eᵢ) × 100 = 50% Therefore, the required pair is: 50%, √(2gh)