The gravitational force between two objects with masses 1kg and 28kg separated by a distance 7m is 10-11 N. a.
3.81

b.
26.68

c.
9151.24

d.
1307.32
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a

Explanation:

As an estimate, consider the two objects as particles separated by 7m.

Take the universal gravitational constant G as 6.67 × 10^(-11) Nm²/kg²

The required gravitational force

= [6.67 × 10^(-11) × 1 × 28] / 7²

≈ 3.811428571 × 10^(-11) N

= 3.81 × 10^(-11) N (corr. to 3 sig. fig.)

∴ The answer should be a. 3.81

if they have a finite resultant