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A kickball is rolled by the pitcher at a speed of 10 m/s and it is kicked by another student. The kickball deforms a little during the kick, and then rebounds with a velocity of 15 m/s as its shape restores to a perfect sphere. What must be true about the kickball and the kicking foot system?A. The kinetic energy of the system before and after the kick is the same.B. The kinetic energy of the system before and after the kick is not the same.C. The momentum of the system before and after the kick is the same.D. The momentum of the system before and after the kick is not the same.
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