question_answer

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

A) \[\sqrt{\left( \frac{GM}{2R} \right)}\]                    

B) \[\frac{1}{2R}\sqrt{\left( \frac{1}{GM} \right)}\]               

C)       \[\frac{1}{2}\sqrt{\left( \frac{GM}{R} \right)}\] 

D)       \[\sqrt{\left( \frac{4GM}{R} \right)}\]