# 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

Question: 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

(A) $\sqrt{2gR}$

(B) 2𝑔R

(C) $\sqrt{3gR}$

(D) $\sqrt{gR}$