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when cycle is at top n bottom places y normal reaction zero at those places? when cycle is at top n bottom places y normal reaction zero at those places?
when cycle is at top n bottom places y normal reaction zero at those places?
thats coz wen the cycle is at the bottom there is virtually no contact btween the cycle and the surface... at the top it is zero only when the velocity is such that the centrifugal force equals the force of gravity.. until and unless there isn't any other external force...
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