If a rock is thrown upward on the planet Mars with a velocity of 15 m/s, its height (in meters) after t seconds is given by H = 15t – 1.86t2. (a) Find the velocity of the rock after two seconds. X m/s (b) Find the velocity of the rock when t = a. m/s (c) When will the rock hit the surface? (Round your answer to one decimal place.) t = (d) With what velocity will the rock hit the surface? m/s

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