A particle is rot A.

B.

C.

D.

Let the particle speed when the string is in vertical plane be v m/sec. Here, it is balanced by its own weight (m× g). When the particle is rotating in a circle centripetal force acts towards the center of the circle. Therefore, we have Now, let the speed of the particle when the string is horizontal be u m/sec. Total energy in horizontal plane = Similarly, total energy in vertical plane = u =