h=-16t^2+25 find the height and time for the projectile motion equation
h=-16t^2+25
h'=-32t
h''=-32
Assuming that this is on earth, I can see that you question is in feet and seconds :)
maximum height is where h'=0 which is when t=0
The projection starts at a height of 25 feet.
so something is being dropped or thrown downwards.
I assume it will hit the ground when h=0
h=0 when
-16t^2+25 =0
16t^2=25
t^2=25/16
t=5/4
It will hit the ground in 1.25 seconds