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

A ball bounces to 80% of its original height. Calculate the mechanical

1.	A ball bounces to 80% of its original height. Calculate the mechanical energy lost in each bounce.
Answer» Solution :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`