Posted by Dani on Thursday, September 22, 2011 at 7:36pm.
Since we don't care about the horizontal motion, just ignore it. The initial vertical velocity
v0 = 49 sin30 = 49 * 1/2 = 24.5
Now, at any time later
v = v0 - at
s = 0 + v0*t - 1/2 a*t^2
= 24.5t - 4.9t^2
= 4.9t(5-t)
So, the arrow is at height=0 at time t=0 and t=5. Therefore, it is at max height when t=2.5
s(2.5) = 24.5*2.5 - 4.9*(2.5)^2 = 30.625 m
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