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Model helicopter accelerating

  1. Jun 14, 2010 #1
    Dynamics question please help i am stuck...!

    A model helicopter of mass 5.0 kg rises with constant acceleration from rest to a height of 60 m in 10 seconds. Find the thrust exerted by the rotor blades during the ascent

    The answer to this question according to the booklet is 55 N
    Please show the working too and the concept apply to come up with the answer

    My attempt

    Thrust denote as F

    weight 50 N..then i am stuck i don't really know what to do
  2. jcsd
  3. Jun 14, 2010 #2


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    Science Advisor
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    Re: dynamics

    Step 1: Use the kinematics equations to find the acceleration
    Step 2: Draw a free body diagram of the rising helicopter, write Newton's 2nd Law and solve for the thrust.
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