Question: A student throws a ball vertically upward so it just reaches the height of a window on the second floor of a dormitory. At the

A student throws a ball vertically upward so it just reaches the height of a window on the second floor of a dormitory. At the same time that the ball is thrown upward, a student at the window drops an identical ball. Are the mechanical energies of the balls the same at half the height of the window? Explain.

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