Kepler's third law states that the square of period of revolution (T) of a planet around the sun, is proportional to third power of average distance of r between sun and planet i.e ${\mathrm{T}}^2={\mathrm{kr}}^3$ where k is constant .If the mass of sun and planet are M, m respectively then as per Newton's law of gravitation force of attraction, $\mathrm{F}=\frac{\mathrm{GMm}}{{\mathrm{r}}^2}$, the relation between $\mathrm{G} \& \mathrm{K}$ is describe as