A small ball is rolled with speed `u` from piont A along a smooth circular track as shown in figure. If `x=3R`, then
Determine the required speed u so that the ball returns to A, the point of projection after passing through C, the highest point.
A. `(3)/(2)sqrt(gR)`
B. `(1)/(2)sqrt(gR)`
C. `(9)/(2)sqrt(gR)`
D. None of these