#### (a) Calculate Earth’s average speed relative to the Sun.

#### (b) What is its average velocity over a period of one year?

**Solution:**

### Part A

The average speed of the earth is equal to the distance traveled divided by the time.

### Part B

After a period of 1 year, the planet Earth has already returned to its original position with respect to the Sun. This means that we do not have any displacement. Therefore, the average velocity is zero.