Warrior Princess Xena (65 kg) swings from a rope and kicks a 100 kg bad guy in the breast with her characteristic two-footed flying kick. When the impact occurs, she comes to a halt and regains her footing. When friction is ignored and the speeds shortly before and after the impact are measured, we may be certain that the following will be true: Conservation of kinetic energy takes place O There is no conservation of momentum or kinetic energy. Energy and momentum are both preserved. It is possible to keep the momentum going.

Warrior Princess Xena (65 kg) swings from a rope and kicks a 100 kg bad guy in the breast with her characteristic two-footed flying kick. When the impact occurs, she comes to a halt and regains her footing. When friction is ignored and the speeds shortly before and after the impact are measured, we may be certain that the following will be true: Conservation of kinetic energy takes place O There is no conservation of momentum or kinetic energy. Energy and momentum are both preserved. It is possible to keep the momentum going.