[单选题]
A ball of mass $0.5\,kg$ strikes a vertical wall with a speed of $30\,ms^{−1}$. The magnitude of the change of the momentum of the ball is $22.5\,kgms^{−1}$. Calculate the speed of the ball just after it rebounds.
A. $0\,ms^{-1}$
B. $5\,ms^{-1}$
C. $10\,ms^{-1}$
D. $15\,ms^{-1}$
