Which law states that every action has an equal and opposite reaction — select the correct answer.

✅ B. Elastic potential energy

A stretched spring stores elastic potential energy. Read more

✅ D. Refraction

Refraction is the change in direction of light due to a change in speed between media. Read more

✅ A. Ammeter

An ammeter measures electric current. Read more

✅ B. Hertz

Frequency is measured in hertz. Read more

✅ C. Voltmeter

A voltmeter measures potential difference. Read more

✅ D. Reflection

Reflection is the return of light from a surface. Read more

✅ A. Mass × velocity

Linear momentum is p = mv. Read more

✅ A. Energy

The joule is the SI unit of energy and work. Read more