A spherical planet has a mass M and diameter D. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to

Q: A spherical planet has a mass M and diameter D. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to

(a) 4GM/D2

(b) GMm/D2

(c) GM/D2

(d) 4GMm/D2

Ans: (b)