Question

A sphere of mass m tied to the end of a string of length l moves along a horizontal circular path with constant speed v.The work done in a complete circle is:

• A. zero
• B. $\frac{m{v}^2}{l}\times 2\pi l$
• C. $mg.2\pi l$
• D. $\frac{m{v}^2}{l}\times l$

Answer 1

The correct option is A zero

After a complete circle,the sphere reaches its initial position,therefore work done is zero.