The minimum and maximum distances of a satellite form the centre of the earth are 2R and 4R respectively, where R is the radius of the earth and M is mass of the earth. The radius of curvature of the orbit at the point of minimum distance is

Q: The minimum and maximum distances of a satellite form the centre of the earth are 2R and 4R respectively, where R is the radius of the earth and M is mass of the earth. The radius of curvature of the orbit at the point of minimum distance is

(a) 5R/3

(b) 7R/3

(c) 8R/3

(d) 3 R