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According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

What’s #16 asking me and how do i solve it?

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.