Four objects are orbiting a star along the same path the objects are the same distance from the star and have the same masses Which planet is experiencing the weakest gravitational force

None, since they have the same mass and are the same distance.

If a planet has a lower mass or is farther away from the star that would be an indication of a weaker gravitational force.

The farthest one from the sun, the fourth one

Explanation:

The gravitational force between any two objects is affected by the masses of the objects and the distance between them. The shorter the distance between two objects, the stronger the gravitational force of attraction is between them.

Since each planet has the same mass, the only factor affecting the strength of gravitational attraction is the distance between the planet and the star. Therefore, the planet that is the greatest distance from the star is experiencing the weakest force of gravitational attraction toward the star.