Question

a comet is traveling by earth. what is the correct relationship of forces acting between earth and the comet?

Explanation:

Step1: Recall Newton's third - law

According to Newton's third - law of motion, for every action, there is an equal and opposite reaction. The gravitational force that Earth exerts on the comet is equal in magnitude and opposite in direction to the gravitational force that the comet exerts on Earth.

Answer:

The second option (the one with arrows pointing towards each other) as the forces are equal in magnitude and opposite in direction.