Answer to Question #21907 in Mechanics | Relativity for Lizbeth
we know that
r = sqrt(G*m1*m2/F) = 9 438 643 m = 9438.6 km
now we can find speed.
where a is centrifugal acceleration.
where m2 is mass of Phobos. Hence the speed is
v=sqrt(r*a) = sqrt(r*F/m2 ) = 2 126.66 m/s = 2.1 km/s
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