Equal and Opposite: Author's Purpose

Why did the author most likely write this passage?

• A.To advertise a product for sale
• B.To teach readers about Newton's third law of motion
• C.To entertain readers with a ghost story

Authors use examples to explain their ideas. Which sentence from the passage gives an example?

• A.Understanding this law helps explain many physical phenomena we observe in our daily lives, from walking…
• B.Another everyday example is when a rocket launches into space.
• C.For example, if you push against a wall, your hand exerts a force on the wall…