Question

A thin rod $MN$, free to rotate in the vertical plane about the fixed end $N$, is held horizontal. When the end $M$ is released the speed of this end when the rod makes an angle a with the horizontal, will be proportional to:

• A. $\sqrt{\sin \alpha }$
• B. $\sin \alpha$
• C. $\sqrt{\cos \alpha }$
• D. $\cos \alpha$

Answer 1

The correct option is A $\sqrt{\sin \alpha }$

Hence, the option $A$ is the correct answer.