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1. The height of a pop fly ball over the time after the ball is hit is modeled by the
function, h(t) = -16t2 + 81t + 5, where h is the ball's height in feet above the
ground and t is the time in seconds after the ball is hit. Use the quadratic formula to
find how many seconds it takes for the ball to hit the ground.

Respuesta :

Answer:

5.12 seconds to the nearest hundredth.

Step-by-step explanation:

When the ball hits the ground h = 0 so

-16t^2 + 81t + 5 = 0

t =  [ -81 +/- sqrt ((81^2 - 4 * -16 * 5)]/ (2*-16)

=  (-81 +/- sqrt 6881) / -32

= 5.12 , -0.6

So the answer is 5.123 seconds.

Answer:

5.123 seconds

Step-by-step explanation:

F(x) = ax2 + bx + c

For further explanation comment

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