The value- of universal gravitational constant $G$ in M.K.S system is $6.67\times {10}^{-11} {\mathrm{Nm}}^2 {\mathrm{kg}}^{-2}$. Its value in C.G.S. system is

Two point masses each equal to $1\mathrm{kg}$ attract one another with a force of $9.8\times {10}^{-9}\mathrm{kg}-\mathrm{wt}$. The distance between the point masses is

($G=6.6\times {10}^{-11}\mathrm{MKS}$ units)

A body weighs $63 \mathrm{kg}-\mathrm{Wt}$ on the surface of Earth. Its weight on the surface of Mars will be (mass of Mars $=\frac{1}{9}$ mass of earth,

radius of Mars $=\frac{1}{2}$ radius of earth)