calculus
posted by marlyn .
im not good in math.
The Grand Canyon is 1600 meters deep at its deepest point; a rock is dropped from the rim above this point. Express the height of the rock as a function of the time t in seconds. How long will it tale the rock to hit the canyon floor?
can someone help me find the answer.

Height measured from the bottom?
height=16001/2 g time^2
how long to the bottom? When is h=0, do that, and solve for time