A kickball is rolled by the pitcher at a speed of $10\text{ m/s}$ and it is kicked by another student. The kickball deforms a little during the kick, and then rebounds with a velocity of $15\text{ m/s}$ as its shape restores to a perfect sphere. Treat the kickball and the kicking foot as an isolated system during the brief kick. Select all that must be true about this system.

Question

A kickball is rolled by the pitcher at a speed of $10\text{ m/s}$ and it is kicked by another student. The kickball deforms a little during the kick, and then rebounds with a velocity of $15\text{ m/s}$ as its shape restores to a perfect sphere. Treat the kickball and the kicking foot as an isolated system during the brief kick. Select all that must be true about this 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.
, (e) Compared to the kicking foot, the ball had the greater change in momentum.
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