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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 perpendiculr to the velocity of the particle. The motion of the particle takes place in a plane. It follows that

A

its velocity is constant

B

its acceleration is constant

C

its kinetic energy is constant

D

it moves in a straight line

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The correct Answer is:
C
When the force is perpendicular to the velocity, the force change direction of velocity not its magnitude and `K.E`. Is constant
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