Question: If a rock is thrown vertically upward from the surface of Mars with velocity 15m/s, its height after seconds is h = 15t - 1.86t2.

If a rock is thrown vertically upward from the surface of Mars with velocity 15m/s, its height after seconds is h = 15t - 1.86t2.
(a) What is the velocity of the rock after 2 s?
(b) What is the velocity of the rock when its height is 25 m on its way up? On its way down?

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