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Q. A stone is thrown vertically upward with a speed of 13.5 m/s from the edge of a cliff 68.0 m high. How much later does it reach the bottom of the cliff?

Q. A 87g arrow is fired from a bow whose string exerts an average force of 130N on the arrow over a distance of 80cm . What is the speed of the arrow as it leaves the bow?

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