First slide

The two types of acceleration

Question

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

Easy

A

the kinetic energy of the particle changes with time
B

the acceleration of the particle is constant
C

the velocity of the particle is constant
D

the speed of the particle is constant

Solution

When applied force is always perpendicular to the direction of motion , path followed by the particle is circular and since acceleration is radially inward , its speed must remain constant.

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