Question

If the distance between the Sun and Earth is increased by three times then attraction between two will:

• A. decreases by 11%
• B. decreases by 33%
• C. decreases by 66%
• D. decreases by 89%

Answer 1

The correct option is D decreases by 89%

$F=\frac{{GM}_m}{r^2}$

Where $F$ is proportional to $r^2$ so we will substitute

Percentage change $=\frac{F_1-F_2}{F_1\times 100}$

While you substitute in formula gravitational force decreased by $89$%.