Question

A stone is thrown upward from ground level. The initial speed is 320 feet per second. In how many seconds will the stone hit the ground?

Answer 1

i assume the inital height is 0

Answer 2

and its in feet sooo -16t^2

Answer 3

-16t^2 + 320t is your position equation

Answer 4

when that bottoms out; the derivative is zero and that is half the time

Answer 5

or simply find the vertex axis at: -b/2a and twice it to get -b/a