Posted by Bob on Wednesday, October 26, 2011 at 10:57pm.
height = -16t^2 + 48t + 10
d(height)/dt = -32t + 48
= 0 at max height
32t=48
t = 48/32 = 1.5
so at 1.5 seconds,
height = -16(1.5)^2 + 48(1.5) + 10 = 59.5 ft
check my arithmetic
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