Posted by Susana on Monday, October 3, 2011 at 1:03pm.
equation:
s = -16t^2 - 22t + 220
v = ds/dt = -32t - 22
so at t=3
v = -16(3) - 22 = -70 ft/sec
when s = 108
108 = -16t^2 - 22t + 220
16t^2 + 22t - 112 = 0
t = (-22 ± √7652)/32 = 2.046 sec or a negative time
so when t = 2.046
v = -16(2.046) - 22 = - 54 ft/s
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