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Posted by **Nilan** on Monday, October 10, 2011 at 7:53am.

h = -16t^2 +vot + 480

If vo = 96, find times when the projectile will be at a) height of 592 ft above the ground and b) crash on the ground.

- algebra -
**Reiny**, Monday, October 10, 2011 at 8:38amso h = -16t^2 + 96t + 480

a)

you want

-16t^2 + 96t + 480 = 592

t^2 - 6t + 7 = 0

(t-7)(t+1) =0

t = 7 or a negative

b)

same thing except now you want

-16t^2 + 96t + 480 = 0

solve for t, use only the positive result

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