Grade 12Mechanics
With what speed must a ball be thrown down for it to bounce back 10m higher than its original level
1 Answer
Arun
Dear student
if there is no loss of energy then you have to give extra kinetic energy to achieve extra 10 "m height.
law of conservation of energy
1/2 mu.u + mgh =mg( h + 10)
1/2mu.u +mgh=mgh+10mg
1/2 u.u =10g
u.u = 20g
u = 14
Regards
Arun (askIITians forum expert)
if there is no loss of energy then you have to give extra kinetic energy to achieve extra 10 "m height.
law of conservation of energy
1/2 mu.u + mgh =mg( h + 10)
1/2mu.u +mgh=mgh+10mg
1/2 u.u =10g
u.u = 20g
u = 14
Regards
Arun (askIITians forum expert)
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