Question:
A ball bounce to 80% of its original height.What fraction of its mechanical energy lost in each bounce
Answer:
Let Initial P.E. = mgh
P.E. after first bounce = mg × 80% of h = 0·80 mgh
P.E. lost in each bounce = 0·20 mgh
∴ Fraction of P.E. lost in each bounce = 0.20 mgh/mgh = 0.20
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