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

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The Answer of 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

A 05-Kg Model Helicopter Initially at Rest on the Ground Starts