A particle is acted upon by a force of constant magnitude which is always perpendicular to the v...

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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) its velocity is constant.
(B) its acceleration is constant
(C) its kinetic energy is constant
(D) it moves in circular path.
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