Question

The gravitational force of attraction between two bodies of masses $40kg$ and $80kg$ separated by a distance of $15m$ is:
(Take Gravitational constant, $G=6.673\times {10}^{-11}N{m}^{2}k{g}^{-2}$)

• A. $9.49\times {10}^{-10}N$
• B. $8.49\times {10}^{-10}N$
• C. $7.49\times {10}^{-10}N$
• D. $6.49\times {10}^{-10}N$

Answer 1

The correct option is A

$9.49\times {10}^{-10}N$

Given:
mass of first body $m_1=40kg$
mass of second body $m_2=80kg$
distance between two bodies, $R=15m$
$G=6.673\times {10}^{-11}N{m}^{2}k{g}^{-2}$

Acc. to Newton's law of gravitation, Gravitational force, $F=\frac{G{m}_1{m}_2}{R^2}$

So, $F=\frac{6.673\times {10}^{-11}\times 40\times 80}{{15}^2}$

On solving, we get $F=9.49\times {10}^{-10}N$