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If a rock is thrown upward on the planet Mars with a velocity of 19 m/s, its height (in meters) after t seconds is given by H = 19t - 1.86t2.

(a) Find the velocity of the rock after two seconds.

(b) Find the velocity of the rock when t = a.

(c) When will the rock hit the surface?

(d) With what velocity will the rock hit the surface?

 

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