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Two particles of equal mass go round a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is

(a)       v = 1/2R √1/gm                (b)    v =√gm /2R

(c)       v=1/2√gm/R                 (d)         v=√4gm/R

Answer:  c

(7)

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