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You’re on a rooftop and you throw one ball downward to the ground below and another...


You’re on a rooftop and you throw one ball downward to the ground below and another upward. The second ball, after rising, falls and also strikes the ground below. If air resistance can be ignored, and if your downward and upward initial speeds are the same, how will the speeds of the balls compare upon striking the ground?

(a) Answer using the equations of kinematics.

(b) Answer using the idea of energy conservation.

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