#### A student drove to the university from her home and noted that the odometer reading of her car increased by 12.0 km. The trip took 18.0 min.

#### (a) What was her average speed?

#### (b) If the straight-line distance from her home to the university is 10.3 km in a direction 25° S of E, what was her average velocity?

#### (c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity for the entire trip?

**Solution:**

### Part A

The average speed is

### Part B

The average velocity is

The direction of the velocity is 25° S of E.

### Part C

The average speed is

And the average velocity is

The average velocity is zero since the total displacement is zero.