A block of mass 1.2 kg moving at a speed of 20 cm/s collides head on with a similar block | keptat rest, the coefficient of restitution is 3/5, the loss of kinetic energy during the collision is:

A

$$6.7 \times 10^{-3}$$ joule

B

$$7.7 \times 10^{-3}$$ joule

C

$$8.7 \times 10^{-3}$$ joule

D

$$17.7 \times 10^{-3}$$ joule