The mass of the iron ball is 200g rotating on a circular path and its radius is r with constant velocity. The work done in one complete revolution will be:

Circular motion is defined as the movement of an object along the circumference of a circle or rotation along a circular path.

Uniform circular motion: Uniform circular motion is defined as circular motion in which the particle's speed remains constant. Force provides the centripetal acceleration in a uniform circular motion. The body's kinetic energy and speed remain constant.

Assuming that,

Mass =$200g$, radius = $r$

Please keep in mind that the movement is circular and uniform. The angle formed by centripetal force and displacement is 90°. The displacement and force are perpendicular to each other.

$=\cos 90° = 0$

Work done $\left(\mathrm{W}\right)=\mathrm{FS} \cos {90}^o=0J$

So, no matter what the mass, radius, or velocity is, the work done is zero.

Then, the work done in one complete revolution is equal to Zero Joule.