A light rigid rod of length l is hinged at one end and it is free to rotate in a vertical plane. A particle of mass m is sattached to anothr and of the rod. The particle is released from rest at its highest point. Select the correct statement out of the following
A. Tension in the rod is zero when it makes an angle of `cos^(-1)""((1)/(3))` with the vertical
B. Tension in the rod is zero when it makes an angle of `cos^(-1)""((2)/(3))` with the vertical
C. Speed of partical of mass m is `sqrt((2)/(3)gl)` when the tension in the rod is zero
D. Speed of particle of mass m is `sqrt((4)/(3)gl)` when the tension in the rod is zero
