A tennis ball coming with volocity, $v_{1}=16 \mathrm{~ms}^{-1} \text { is }$ is sent back by a racket in the opposite direction with volecity, $v_{2}=20 \mathrm{~ms}^{-1}$ If the change of kinetic energy of the ball is AE = 9.25J, then calculate the change of momentum of the ball.