An inelastic ball is dropped from a height of 100 m. Due to earth, 20% of its energy is lost. To what height the ball will rise

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80 m

40 m

60 m

20 m

answer is A.

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Detailed Solution

NEW P.E =mgh'=80100×mg×100⇒h'=80m when 20 % of energy is lost then the body will rise to 80 % of the initial height from which it falls.

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