Center of MassHard
Question
A ball hits a floor and rebounds, then
Options
A.the momentum of the ball before and after the collision is same.
B.the mechanical energy of the ball may remains same during the collision
C.the total momentum of the ball and the earth is conserved
D.the total energy of the ball and the earth remains the same
Solution
Internal force between ball and earth can change kinetic energy but it can not change momentum of the ″ball plus earth″ system.
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