Question

A particle of mass m is fixed to one end of a light rigid rod of length l and rotated in a vertical circular path about its other end. The minimum speed of the particle at its highest point must be-

• A. Zero
• B. $\sqrt{g\mathcal{l}}$
• C. $\sqrt{1.5\mspace{6mu} g\mathcal{l}}$
• D. $\sqrt{2\mspace{6mu} g\mathcal{l}}$

Answer 1

Answer: (A)

Zero

Answer 2

To complete the circle by a light rod, velocity at highest point is zero.