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 $\alpha $ with the horizontal, will be proportional to ( see figure)
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 $\alpha $ with the horizontal, will be proportional to ( see figure)
- [JEE MAIN 2018]
- A
$\sqrt {\cos \alpha } $
- B
$\cos \alpha $
- C
$\sin \alpha $
- D
$\sqrt {\sin \alpha } $
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