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A ball bounces to 80% of its original he...

A ball bounces to 80% of its original height. Calculate the mechanical energy lost in each bounce.

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Let Initial P.E.=mgh
`"P.E. after first bounce" =" mg"xx80% "of" h=0.80 mgh`
P.E.lost in each bounce =0.20 mgh
`therefore` Fraction of P.E. lost in each bouce `=(0.20mgh)/(mgh)=0.20`
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