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A body of mass ' \(m\) ' dropped from a height ' \(h\) ' reaches the ground with a speed of \(0.8 \sqrt{g h}\). The valu…

Q1

A body of mass ' \(m\) ' dropped from a height ' \(h\) ' reaches the ground with a speed of \(0.8 \sqrt{g h}\). The value of work done by the air-friction is:

a

\(-0.68 \mathrm{mgh}\)

b

\(0.64 \mathrm{mgh}\)

c

\(\mathrm{mgh}\)

d

\(1.64 \mathrm{mgh}\)

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