A body of mass 'm' dropped from a height 'h' reaches the ground with a speed of 0.8$\sqrt {gh} $. The value of workdone by the air-friction is : - DASH

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Question

A body of mass 'm' dropped from a height 'h' reaches the ground with a speed of 0.8$\sqrt {gh} $. The value of workdone by the air-friction is :

$-$0.68 mgh

mgh

1.64 mgh

0.64 mgh

Solution

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