Test 3.2

2. If two bodies of equal masses move with uniform velocity of 'v' and '3v', what will be the ratio of their kinetic energies?

Solution: Mass of first body = m

         Velocity of the first body = v
         Mass of second body = m
         Velocity of second body = 3v

The ratio of kinetic energies of the two bodies = (kinetic energies of first body)/(kinetic energies of second body)

                                               =((1/2)mv2)/((1/2)m(3v)2)
                                               =1/9

Therefore the ratio of the kinetic energies = 1:9