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

question 6

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

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