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[" 8.A point "P(R sqrt(3),0,0)" lies on ...

[" 8.A point "P(R sqrt(3),0,0)" lies on the axis of a ring of mass "M],[" and radius "R" .The ring is located in "y-z" plane with its "],[" centre at origin "O." A small particle of mass "m" starts from "],[P" and reaches "O" under gravitational attraction only.Its "],[" speed at "O" will be "],[[" (a) "sqrt((GM)/(R))," (b) "sqrt((Gm)/(R))],[" (c) "sqrt((GM)/(2R))," (d) "sqrt((Gm)/(sqrt(2)R))]]

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