A thin rod MN free to rotation 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
Option1 `sqrt(cos alpha)`
B
Option2 `cos alpha`
C
Option3 `sin alpha`
D
Option4 `sqrt(sin alpha)`
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