Q: With what minimum speed should *m* be projected from point C in presence of two fixed masses M each at A and B as shown in the figure such that mass *m* should escape the gravitational attraction of A and B?

(a) $ \displaystyle \sqrt{\frac{2GM}{R}} $

(b) $\displaystyle \sqrt{\frac{2\sqrt2 GM}{R}} $

(c) $ \displaystyle 2\sqrt{\frac{GM}{R}} $

(d) $ \displaystyle 2\sqrt2 \sqrt{\frac{GM}{R}} $

Ans: (b)