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A particle is acted upon by a force of a 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 a 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 a straight line

This question was posed to me in examination.

Question is from Laws of Nature topic in chapter Laws of Motion of Engineering Physics I

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Correct choice is (c) Its kinetic energy is constant

Easy explanation: It is a case of uniform motion in which velocity and acceleration vectors change due to change in direction. As the magnitude of velocity remains constant, the kinetic energy is constant.

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