Posted by Anonymous on Tuesday, November 16, 2010 at 7:42pm.
Well, we would have to ignore air resistance which would have a major effect here but (using english units because you used feet):
v = Vo - 32 t
v = 0 at top
Vo = 32 t
h = 0 + Vo t - 16 t^2
550 = 32 t^2 - 16 t^2 = 16 t^2
t^2 = 34.4
t = 5.86 seconds
Vo = 32 t = 187 feet/second
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