Question

A boy of mass 60kg runs at a speed of 60m/s .calculate the work done

Answer 1

here the work done, is in the form of kinetic energy (K.E.)
  K.E.= 1/2 mv^2
given,
mass= 60kg
speed= 60m/s
there fore,
   K.E.= 1/2x 60x (60)^2
          =108000 J
Ans is 108000J

Answer 2

mass = 60 kg
velocity = 60 m/s
work done = K.E = 1/2*m*v*v
= 1/2*60*60*60
= 10800 J
= 1.08 *10⁵ J

i hope it helps..........