A rod of length lis held vertically stationary with its lower end located at a point P, on the horizontal plane. When the rod is released to topple about P, the velocity of the upper end of the rod with which it hits the ground is
A
gl
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B
gl
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C
3gl
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D
5gl
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Solution
The correct option is C3gl I = moment of inertia of metre stick about point A=ml23. By the law of conservation of energy mg12=12Iw2=12ml23vBl2 By solving, we get vB=3g/l