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Mathematics 9 Online
OpenStudy (anonymous):

If a rock is thrown upward on the planet Mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by H = 12t - 1.86t2. (Round all numbers to two decimal places.) (a) Find the velocity of the rock when t = a. (b) Find the velocity of the rock after one second. (c) When will the rock hit the surface? (d) With what velocity will the rock hit the surface?

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