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cestrela7 [59]
3 years ago
5

if a toy rocket is launced vertically upward from ground level with an inital velocity of 128 feet per second, then its high h,

after t seconds is given by the equation h(t)=-9t^2 +81 round to the nearest foot when does the ball hit the ground?
Mathematics
1 answer:
makkiz [27]3 years ago
7 0
The toy rocket hits the ground when h(t) = 0.
So, h(t) = 0 = -9t^2 + 81.

Solving the equation,
-9t^2 = -81
Dividing by -9
t^2 = 9
Taking the square root.
t = 3

The answer is 3 seconds.
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