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    An aircraft moves in a vertical circle with radius 100m at a constant speed. Find the acceleration. Find the speed such that weightlessness is experienced at the top of the circle.
    I'm stuck on this question. I thought there'd be no tangential acceleration or v would change. I tried Conservation of Energy and resolving radially but couldn't get anywhere with that either.
    Could someone give a hint to put me in the right direction?
    Thanks.
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    You could try resolving radially at the top, and since weightlessness is experienced, the upwards force acting on the plane must cancel out the weight.
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    I think you have to use the conservation of energy with vertical circles...
 
 
 
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