A 05-Kg Model Helicopter Initially at Rest on the Ground,starts to to Move

question 86

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,calculate the helicopter's velocity just before hitting the ground.

• A)-36.7 m/s
• B)-48.4 m/s
• C)-65.5 m/s
• D)-103 m/s
• E)-116 m/s

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