Question

An object of mass m moves with constant speed in a circular path of radius R under the action of a force of constant magnitude F. The kinetic energy of object is

• A. $\frac{1}{2}FR$
• B. $FR$
• C. $2FR$
• D. $\frac{1}{4}FR$

Answer 1

The correct option is A $\frac{1}{2}FR$

$F=\frac{m{V}^2}{R}$

$=\frac{FR}{2}=\frac{m{V}^2}{2}$

$\therefore KE=\frac{FR}{2}$

Hence$,$ option $\left(A\right)$ is correct$.$