A golf ball is hit from ground level. The height of the ball can be modeled by h(t)=−16t2+64t, where h is the height of the ball in feet after t seconds. Determine the length of time the ball was in the air. Use mathematics to justify your answer.

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hello from mrbilldoesmath!

answer:   x^2 + y^2 = 1024

discussion:

the equation of a circle with center (h,k) and radius "r" is

(x-h)^2 + (y-k)^2 = r^2.

in our case

(x-0)^2 + (y-0) ^2 = 32^2 = 1024

you,

mrb