JEE Main Physics question

Physics Laws of Motion JEE Main

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 [IIT JEE 1987]

(A)Velocity is constant
(B)Acceleration is constant
(C)Kinetic energy is constantCorrect
(D)It moves in a circular pathCorrect

Answer: (C),(D)

Solution

A force of constant magnitude, always perpendicular to velocity, does no work, so speed (and hence kinetic energy) stays constant — (C) true. Velocity (a vector) changes direction continuously, so it is not constant — (A) false. The acceleration's magnitude is constant (), but its

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Question ID VK-158375