Question

Find the time it takes an objecy to hit the ground when it is dropped from a height of s feet.

h=-16t^2+s

s=80

Answer 1

Set h equal to 0 and solve for t.

Answer 2

ok.... the subsititute s = 80 and let h = 0

0 = =16t^2 + 80

16t^2 = 80

t^2 = 5

now solve for t to get the time...

Answer 3

when the object hits the ground then h = 0

since it's given s= 80 just substitute

0 = -16t^2 + 80

16t^2 = 80

solve for t

Answer 4

does that help?

Answer 5

yeah thanks