The following table shows the distance from the sun of some unknown planets of equal mass. distance from sun planet distance from sun y 1 au z 0.39 au which of the following best explains which planet revolves at a slower speed? planet y, because the sun pulls it with a greater force planet z, because the sun pulls it with a greater force planet y, because the gravitational force is weakened by distance planet z, because the gravitational force is strengthened by distance

Option (3)

Explanation:

Given that, planet Y is at a distance of 1 AU away from the sun, and the planet Z is at a distance 0.39 AU away from the sun.

From Kepler's law of astronomical unit, it is known that the planets that are closer to the sun move at a faster rate in comparison to the distant planets because of their high gravitational force.

So from the given condition, it can be concluded that the planet Y is at a greater distance (1 AU) from the sun, which will orbit the sun at a much slower rate because of its comparatively weaker gravitational force, as the speed of a planet is directly affected by the distance from the sun.

Thus, the correct answer is option (3).