Go back to Checkpoint 9.3 and answer the same two questions in terms of the directions of
Question:
Go back to Checkpoint 9.3 and answer the same two questions in terms of the directions of the applied forces and the force displacements. Do your answers agree with those you gave in Checkpoint 9.3?
Data from Checkpoint 9.3
A ball is thrown vertically upward.
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?
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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The directions of the force and the force displacement are consistent with ...View the full answer
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