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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 of the particles takes place in a plane. It follows that


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

The correct option is A its kinetic energy is constant
Work done by such force is always zero since force is acting in a direction perpendicular to velocity
therefore from work energy theorem$$= \Delta K = 0$$
K remains constant

Physics

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