use the function h(t)=-16t+vt+h0 to determine how long the rocket is out of sight
So we're looking for h(t) > 1000 because the rocket is out of sight when it is about the cloud
Assume h0 = 0
-16t^2 + vt > 1000
-16t^2 + 315t - 1000 > 0
Use quadratic formula to get
t = 3.98 s
t = 15.71 s
So then, the rocket is out of sight for
15.71 - 3.98 = 11.7 s
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