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(C) In a collision,the total momentum of the system is conserved if no external impulsive force acts on the system. When a ball hits the floor,the for

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The total momentum of the ball-earth system is conserved.

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(C) In a collision,the total momentum of the system is conserved if no external impulsive force acts on the system. When a ball hits the floor,the force exerted by the floor on the ball and the force exerted by the ball on the floor are internal to the 'ball-earth' system. Therefore,the total momentum of the 'ball-earth' system remains conserved. Although the collision is elastic,the mechanical energy of the ball alone is not conserved because it transfers energy to the earth during the impact. However,in an elastic collision,the total kinetic energy of the system is conserved.

$A$ ball hits the floor and rebounds. For this elastic collision case,which of the following is true?

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