If a rock is thrown vertically upward from the surface of Mars with velocity of 15 m/s, its height (in meters) after t seconds

Question

If a rock is thrown vertically upward from the surface of Mars with velocity of 15 m/s, its height (in meters) after t seconds is h = 15t-1.86t².
(a) What is the velocity (in m/s) of the rock after 1 s?
11.28 m/s
(b) What is the velocity (in m/s) of the rock when its height is 10 m on its way up? On its way down?

Kunduz · Accepted Answer

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