Question 2.6.15: A ball is released from some height above the earth's surfac...

A ball is released from some height above the earth’s surface. Treat the ball and the earth as the entire system under consideration. As the ball falls, is the momentum of the system conserved?

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Yes, because there are no external forces on the system. The earth exerts a force on the ball but the ball exerts an equal and opposite force on the earth. Hence the net force on the earth-ball system is zero.

(This means that as the ball falls, the earth moves up a bit!)

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