Question 863712
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Hi
s (t) = -16t^ + 400t    |s' = -32t + 400, t = 12.5
      = -16(t - 400/32)^2) + 2500  |Completing Square
      = -16(t - 12.5)^2) + 2500
Hmax = 2500ft in 12.5sec