Question

PLZ ANSWER FAST!
An apple is launched directly upward at 64 feet per second from an 80-foot tall platform. The equation for this apple’s height, h, at time t seconds after launch is h = -16t2 + 64t + 80.
a. Find the maximum height of the apple.


b. How many seconds will it take for the apple to reach the ground

Answer 1

Answer:

An apple is launched directly upward at 64 feet per second from a platform 80 feet high. The equation for this apple's height h at time t seconds after launch is -80 = -16t2 + 64t. How many seconds will it take the apple to hit the ground? 144 ft.

Answer 2

Answer:

144 feet

5 seconds

Step-by-step explanation:

a.

we want the maximum (or the vertex)

-64/-32= 2

-16*2²+64*2+80=144

b.

Here we want the point in which the y=0

In other words, we want the x-intercept

-16x²+64x+80= -16(x-5)(x+1)

so we have

(5,0) and (-1,0)

reject the negative answer to get 5 seconds