A helicopter weighs 20,500 lb. It takes off vertically from sea level, and its upward velocity in ft/s is given as a function of its altitude h in feel by v = 66 – 0.01h.
(a) How long does it take the helicopter to climb to an altitude of 4000 ft?
(b) What is the sum of the vertical forces on the helicopter when its altitude is 2000 ft?
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