Mathematics

8 April, 11:55

A rock is dropped from the top floor of a tall building. Its height above the ground (in meters) is given by the formula h (t) = 500-5t2, where t is the time in seconds after the rock is thrown. a) When does the rock hit the ground? b) What is the speed of the rock at the time found in part a) ? c) How tall is the building?

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