Read the scenario. A car starts 10 m north of a reference point. It moves at a constant velocity over the next 5 s, reaching a position of 10 m south of the reference point.

What is the car’s average velocity?

2 m/s south

0 m/s

4 m/s south

4 m/s north

v_avg = 4 m/s

Explanation:

The average velocity of the car is given by the distance traveled by the car, in a specific time.

The total distance is 20m, because the car moved to the reference point (10m), and then moves to 10m to the south. THe total distance is 20m.

Then, you use the following formula:

x_t: total distance traveled by the car =  20m

t: time in which the car made the trajectory =  5s

You replace the values of x_t and t:

hence, the average velocity is 4m/s

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explanation:

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