A boy of mass 80 kg is running at 10 m/s. Find the work done by him.
Work done = Kinetic Energy possessed by a body.
Kinetic Energy = 
Given
Mass (m) = 80 Kg;
Velocity (v) = 10 m/s;
Kinetic Energy = 
⇒ Kinetic Energy = 
Hence the work done is 4000 J.
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