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Q. Someone in a car going past you at the speed of 20 meters per second drops a small rock from a height of 2 meteres. How far from the point of the drop will the rock hit the ground?

Q. A 1.0 kg brick is held a distance of 2 m above a manhole and then dropped into it. The bottom of the manhole is 3 m below the street. What is the potential energy at each location below? (Assume U = 0 at street level.)

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