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Question

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

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

The correct options are
C it moves in a circular path
D its kinetic energy is constant
This is an example of uniform circular motion, K.E. is constant and also magnitudes of velocity and acceleration but the directions of velocity and acceleration are not constants.

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