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-
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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-

G1 Physics · Accepted Answer

Because the force is always perpendicular to velocity, instantaneous power F⃗·v⃗=0. Hence kinetic energy and speed remain constant, although the direction of velocity changes. Therefore C.