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August 29, 2015

Homework Help: College math

Posted by Michala on Sunday, July 20, 2014 at 1:40pm.

A rock is thrown from the top of a tower that is 400 feet tall. If its height above the ground can be modeled by

h = -16t2 + 64t +400 where h is in feet, and t is in seconds.
To the nearest tenth of a second, how long does it take the rock to reach the ground?
To the nearest tenth of a second, how long will it take the rock to reach its maximum height?

To the nearest tenth of a foot, how high will the rock go before it starts falling down?

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