Question

A mass of 5 kg is held at a position 2 m away from a mass of 10 kg. What is the gravitational attraction between the two masses?
Take value of $G$ as $6.67\times {10}^{-11}N{m}^{2}k{g}^{-2}$

• A. $8.3\times {10}^{-10}N$
• B. $4.2\times {10}^{-10}N$
• C. $5.7\times {10}^{-10}N$
• D. $9.7\times {10}^{-10}N$

Answer 1

The correct option is A $8.3\times {10}^{-10}N$

From Newtons law of gravitation,
$F=\frac{G{m}_1{m}_2}{r^2}$
where, $G$ is the universal gravitational constant, $m_1$ and $m_2$ is the mass of the body and $r$ is the distance between them.
$F=\frac{6.67\times {10}^{-11}\times 5\times 10}{2^2}$
$F=1.7\times {10}^{-9}N$