In a circus stuntman rides a motorbike in a circular track of radius R in the vertical plane. The minimum speed at highest point of track will be 

(1) 2gR

(2) 2gR

(3) 3gR

(4) gR

Concept Videos :-

#25-Friction-as-Centripetal-Force- Solved-Examples-13

Concept Questions :-

Uniform circular motion
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