A problem by Rony Hasan
Level
pending
If a ball fall on floor from 80m hight & lose 20% energy for counterstroking of floor.Then how long the ball will rise??..
The answer is 64.
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1 solution
We know that, W=mgh =mg×80 j Now,80% energy is available, mg×80×80% j W=mg×64 =>mgh=mg×64 =>h =64 m (ans.)