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In a) momentum is not conserved because if there is an outside force acting on the ball (Gravity is an external force). In b) momentum is conserved when the earth-ball system has no net momentum its final and initial momentum is the same, therefore it is constant.

I assumed that there were no external forces since air resistance was neglected. So, when no external forces act on an object the total momentum is constant. The Earth in the system causes the external force (mg) to become internal to the system and is canceled out by the third law force pair of...

1. The problem statement, all variables, and given/known data A baseball is thrown from the outfield toward the home plate. a) Neglecting air resistance, is the momentum of the ball conserved during its flight? explain b) Neglecting the air resistance, is the momentum of the earth-ball system...