Which of the following is correct? What is the SI unit of power?

✅ D. Elastic potential energy

A stretched spring stores elastic potential energy. Read more

✅ B. Hertz

Frequency is measured in hertz. Read more

✅ D. 9.8 m/s²

Near Earth's surface, gravitational acceleration is approximately 9.8 m/s². Read more

✅ A. 3 × 10^8 m/s

Light travels in vacuum at approximately 3 × 10^8 meters per second. Read more

✅ C. Elastic potential energy

A stretched spring stores elastic potential energy. Read more

✅ A. Refraction

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

✅ B. ½mv²

Kinetic energy is one-half mass times velocity squared. Read more

✅ D. Reflection

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