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a ball is drop from height h on a horizoantal floor if otloss 6o% of its energy in hitting the floor

a ball is drop from height h on a horizoantal floor if otloss 6o%  of its  energy in hitting the floor

Grade:11

1 Answers

Arun
25750 Points
6 years ago
Dear Aviral
 
The velocity of ball just before hitting the floor is sqrt(2gh) and its kinetic energy will be 1/2mu^2=mgh.

after hitting it loses 60% of its energy or we say it possess only 40% of its initial energy .

its energy after hitting the floor is 40/100(mgh)

after reaching its maximum height h' it will lose all its kinetic energy and will possess only potential energy which is mgh'.

therefore law of conservation of energy says that 
mgh'=40/100(mgh)
h'=0.4h
 
Regards
Arun (askIITians forum expert)

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