Question

the rate of motion over a certain amount of time is

gravitational force

heat

friction

speed

Explanation:

• Gravitational force: It is the force of attraction between two objects with mass, not related to the rate of motion.
• Heat: It is a form of energy transfer, not related to the rate of motion.
• Friction: It is a force that opposes motion, not the rate of motion itself.
• Speed: By definition, speed is the rate of motion over a certain amount of time.

Answer:

speed