Posted by Joe on Monday, April 19, 2010 at 9:33pm.
0 = 100 + 60 t - 16 t^2
16 t^2 - 60 t - 100 = 0
4 t^2 - 15 t -25 = 0
(4 t + 5)(t - 5) = 0
t = 5
t=5
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