Question

The two factors that combine to keep Earth and the moon in their orbits are

a. gravity and orbital speed.
b. orbital speed and mass.
c. mass and inertia.
d. gravity and inertia.

Answer 1

Gravity and Inertia.

Answer 2

The two factors that combine to keep Earth and the moon in their orbits are gravity and inertia. Correct answer: D

The gravity is an invisible force that pulls objects toward each other. This force keeps all of the planets in orbit around the sun. Inertia on the other hand is the tendency to resist changes in their state of motion.