Maharashtra State PSC Model Paper 5

Question : 73 of 100

Marks: +1, -0

A particle is actuated by a force of constant magnitude which is always perpendicular to the velocity of the particle, the velocity of the particle is on a flat surface. It follows that

Its acceleration is constant.
Its kinetic energy is constant.
Its distance is constant
Its velocity is constant.

Validate

Solution:

The correct answer is Its kinetic energy is constant.

As mentioned in the given condition, the particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, so work done by the force in the direction of the velocity is zero.
Therefore, the magnitude of velocity would not change due to this force.
${KE}=\;{{1}}/{2} {mv}^{2}$
As we know mass and magnitude of velocity will always be constant in this given situation so the kinetic energy will also be constant.

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