A person standing at a ridge in the Grand Canyon throws a penny upward and toward the pit of the canyon. The height of the penny is given by the function h(t)=-12t^2+80t
a. What is the maximum height of the penny?
b. How many seconds will it take the penny to hit the ground?

Question

A person standing at a ridge in the Grand Canyon throws a penny upward and toward the pit of the canyon.  The height of the penny is given by the function h(t)=-12t^2+80t
a. What is the maximum height of the penny?
b.  How many seconds will it take the penny to hit the ground?

anonymous · Answer

a) to find the max height, find the derivative of your equation with respect to t. then set that equal to 0, and then solve for t. once you get t, plug it back into the original equation you have.
b) to know part b, we will need to know how deep the canyon is..