A particle moves in circular path with decreasing speed. Which of the following is correct.

Options

A. It will move in a spiral and finally reach the centre
B. Acceleration `veca` is towards the centre
C. Only direction of `vecL` is constant
D. `vecL` is constant.

Answer

C

Explanation

Particle is moving with decreasing speed so it has tangential component of acceleration also along with the radial acceleration hence net acceleration of the particle cannot be towards the centre. Magnitude of its angular momentum is mur which decreases with decreasing speed. But direction of angular momentum remains along the axis of rotation. Hence option (c) is correct.