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If a rock is thrown upward on the planet Mars with a velocity of 23 m/s, its height (in meters) after t seconds is given by H = 23t - 1.86t2. (Round all numbers to two decimal places.)

(a) Find the velocity of the rock after two seconds.
1 m/s

(b) Find the velocity of the rock when t = a.
2 m/s

(c) When will the rock hit the surface?
t = 3 seconds

(d) With what velocity will the rock hit the surface?
4 m/s

 

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