1.

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 [CBSE PMT 1995; RPMT 2003]

A.                \[v=\frac{1}{2R}\sqrt{\frac{1}{Gm}}\]      
B.                \[v=\sqrt{\frac{Gm}{2R}}\]
C.               \[v=\frac{1}{2}\sqrt{\frac{Gm}{R}}\]
D.                             \[v=\sqrt{\frac{4Gm}{R}}\]
Answer» D.                             \[v=\sqrt{\frac{4Gm}{R}}\]


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