Question: A ball is thrown vertically upward. (a) As it moves upward, it slows down under the influence of gravity. Considering the changes in energy of

A ball is thrown vertically upward.

(a) As it moves upward, it slows down under the influence of gravity. Considering the changes in energy of the ball, is the work done by Earth on the ball positive or negative?

(b) After reaching its highest position, the ball moves downward, gaining speed. Is the work done by the gravitational force exerted on the ball during this motion positive or negative?

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