Question

A particle moves in circular path with decreasing speed. Which of the following is correct.
A. `vec L` is constant
B. only direction of `vec L` is constant
C. acceleration `vec a` is towards the centre
D. it will move in a spiral and finally reach the centre

Answer 1

Correct Answer - B
`vec L = m(vec r xx vec v)`
Direction of `(vec r xx vec v)` is constant, hence the direction of angular momentum remains the same.