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. it moves in a straight line.

Answer

C

Explanation

As the direction of velocity changes, it cannot said to be constant .K.E is a sacalar quantity and change is the direction does not matter in this case . Hence .K>E is constant .