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A particle is acted upon by a force of c...

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

A

It's velocity is constant

B

It's acceleration is constant

C

It's kinetic energy is constant

D

It moves in a straight line

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The correct Answer is:
C
What a force of constant magnatude which is perpendicular to the velocity of partical , work done is zero and hence charge in kinetic energy is zero.
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