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September 21, 2014

September 21, 2014

Posted by **Jery** on Tuesday, April 20, 2010 at 1:32am.

- Calculus -
**Reiny**, Tuesday, April 20, 2010 at 7:39amv(t) = s'(t) = 112 - 32t

at max v = 0

32t = 112

t = 3.5

then s(3.5) = ......

when it hits the ground, s(t) = 0

16t^2 - 112t - 32 = 0

t^2 - 7t - 2 = 0

solve using the quadratic formula,

sub the positive answer into v(t)

- Calculus -
**Kelly**, Tuesday, April 20, 2010 at 7:37pmHi I have the same question. The first part is correct to find the maximum height, but while solving for the quadratic formula to find the velocity when it hits the ground, the answer is incorrect. (You would get 7.2749 and -0.27492 after solving the quadratic)

- Calculus -
**Kelly**, Tuesday, April 20, 2010 at 7:41pmNevermind! I figured out you're supposed the plug the positive value into the derivative v'(t).

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