A ball falls vertically and bounces off the ground. Immediately before impact with the ground the speed of the ball is \(u\). Immediately after leaving the ground the speed is \(v\).

Which of the following expressions is the ratio of \(\frac{{{\text{kinetic energy lost on collision}}}}{{{\text{kinetic energy immediately before collision}}}}\)?

A.     \(\frac{v}{u}\)

B.     \(1 - \frac{v}{u}\)

C.     \({\left( {\frac{v}{u}} \right)^2}\)

D.     \(1 - {\left( {\frac{v}{u}} \right)^2}\)

D