IMAT 2011 Q75 [Law of Gravitation]

The law of gravitation states that the gravitational force between two bodies of mass m1 and m2 is given by:

{{F=}\frac{Gm_1m_2}{r^2}}

G (gravitational constant) = {7 \times10^{-11} Nm^2kg^{-2}}
r (distance between the two bodies) in the case of the Earth and Moon = { 4 \times 10^8 m}
{m_1} (Earth) = { 6 \times 10^{24} kg}
{m_2} (Moon) = {7 \times 10^{22} kg}

What is the gravitational force between the earth and the moon?

A. 1.8365 x 1019N

B. 1.8365 x 1020N

C. 1.8365 x 1025N

D. 1.8365 x 1026N

E. 1.8365 x 1028N