Question: A stone is thrown vertically upward with a speed of 18.0 m/s. (a) How fast is it moving when it reaches a height of 11.0m?

A stone is thrown vertically upward with a speed of 18.0 m/s.
(a) How fast is it moving when it reaches a height of 11.0m?
(b) How long is required to reach this height?
(c) Why are there two answers to (b)?

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