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23. A stone is thrown straight down form the top of a cliff at a speed of 4.90 m/s, at the same instant that a

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23. A stone is thrown straight down form the top of a cliff at a speed of 4.90 m/s, at the same instant that a ball is thrown vertically up from the base of the cliff at a speed of 39.2 m/s. If the cliff is 87.2 m high, how far apart will the stone and ball be when the downward speed of the stone is the same as the upward speed of the ball

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