Question

A block of mass m is rotating in a circular path of radius r at constant speed v . Calculate the work done by the centripetal force during one half of a revolution?

• A. $\pi m{v}^2$
• B. $2\pi m{v}^2$
• C. 0
• D. $\pi m{v}^{2}r$
• E. $2\pi m{v}^{2}r$

Answer 1

The correct option is C 0

Work done $=$ force $\times$ displacement

For a circular path, the displacement will be zero. So, the work done will be zero.