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A stone is thrown straight up with a speed of 15.0 m/s. How fast will it

be moving when its altitude is 8.0 m above the point from which it was

thrown? How much time elapses while the stone is reaching that height?

(Is there one answer or are there two answers? Why?)

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I know that the stone goes up and then down again, so there could be two answers, but how exactly would I solve this problem?