Work done = Kinetic Energy possessed by a body.
Kinetic Energy = \(\frac{mv^2}{2}\)
Given
Mass (m) = 80 Kg;
Velocity (v) = 10 m/s;
Kinetic Energy = \(\frac{80\times10^2}{2}\)
⇒ Kinetic Energy = \(\frac{8000}{2}\) = 4000 J
Hence the work done is 4000 J.