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September 15, 2014

Homework Help: math

Posted by faith on Thursday, December 15, 2011 at 9:46pm.

A person standing on the roof of a building throws a ball directly upward. The ball misses the rooftop on its
way down and eventually strikes the ground. The function s(t) = −16t2 + 64t + 80 describes the ballís height
above the ground, s(t) , in feet, t , seconds after it was thrown.
a. Find the ballís average velocity between the time it was thrown and 2 seconds later.
b. Find the ballís average velocity between 2 and 4 seconds after it was thrown.

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