posted by zac .
A stone is thrown straight down from the edge of a roof, 750 feet above the ground, at a speed of 7 feet per second.
A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 5 seconds later?
B. At what time does the stone hit the ground?
C. What is the velocity of the stone when it hits the ground?