A particle is tied to one end of a light inextensible string and is moving in a vertical circle, the other end of string is fixed at the centre. Then for complete motion in circle, which is/are incorrect. (air resistance is negligible)
(A) Acceleration of the particle is directed towards the centre.
(B) Total mechanical energy of the particle and earth remains constant
(C) Tension in the string remains constant
(D) Acceleration of the particle remains constant
