A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that

Options

A. its velocity is constant
B. its acceleration is constant
C. its kinetic energy is constant
D. its moves in a circular path

Answer

C, D

Explanation

The given case is of uniform circular motion, in which speed of particle remains constant. Direction of velocity and acceleration keep on changing although its magnitude remains constant.