Multiple Choice
A 0.5-kg model helicopter initially at rest on the ground starts to move directly up under the effect of a lift force of magnitude of 7.4 N.After 12 seconds the engine stops and the helicopter starts free fall.Ignoring air resistance,what is the maximum height the helicopter reaches?
A) 189.5 m
B) 245.3 m
C) 318.9 m
D) 432.6 m
E) 543.7 m
Correct Answer:

Verified
Correct Answer:
Verified
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