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Q.

A rubber ball falling from a height of 5m rebounds from a hard floor to a height of 3.5m. The percentage loss of energy during the impact is

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a

20%         

b

43%         

c

30%         

d

50%         

answer is B.

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Detailed Solution

Percentage loss =(PE)f−(PE)i(PE)i×100 =1.55×100 = 30%

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