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December 22, 2014

December 22, 2014

Posted by **miguel** on Tuesday, August 6, 2013 at 11:17pm.

- math -
**Reiny**, Wednesday, August 7, 2013 at 12:32amwhen it hits the ground, h = 0

so solve:

16t^2 - 32t - 240 = 0

t^2 - 2t - 15 = 0

(t-5)(t+3) = 0

t = 5 or t = -3, which is not acceptable

it will hit the ground after 5 seconds

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