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A freely falling body takes 4 s to reach the ground. One second after release, the percentage of its initial potential energy, that is still retained is

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a

6.25%

b

25%

c

37.5%

d

93.75%

answer is D.

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Detailed Solution

PEfPEi×100=mg(12g(4)2−12g(1)2)mg12g(42) = 16−116×100=93.75%

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