Question

A small object is tied to a string and whirled in a vertical circle of radius L. What should be the minimum speed at the topmost point of the circle so that the string just remains taut?

• A. \( \sqrt{2gL} \)
• B. \( \sqrt{gL} \)
• C. \( \sqrt{3gL} \)
• D. Zero

Hint:

In circular motion, the minimum speed required to keep the string taut at the topmost point is determined by balancing the gravitational force and the centripetal force.