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SOLVE THE FOLLOWING PROBLEMS:

1. A man walks 5 km in 2 ours and 2 km in 1 hour in the same direction. What is its average speed?

2. A car travelled 7 km, East in 2 hours and then 2.5 km, West in 1 hour. What is its average speed?

3. You start walking in an oval measuring 500 meters and you came back to where you started. The whole journey took 600 seconds. What is your average velocity?

Sagot :

Fundamental Concepts

Average Speed

Average speed is calculated as follows:

average speed = total distance travelled ÷ total time

Average Velocity

Average velocity is calculated as follows:

average velocity = total displacement ÷ total time

Application to Exercise

  1. The total distance travelled is 7 kilometers. The total time travelled is 3 hours.

    average speed = 7km ÷ 3 hours
    average speed = 2.33 km/hr

  2. The total distance travelled is 9.5 kilometers. The total time travelled is 3 hours.

    average speed = 9.5 km ÷ 3 hours
    average speed = 3.17 km/hr

  3. The total distance travelled is 500 meters. However, since you came back to the point where you started, your total displacement is 0. The total time travelled is 600 seconds.

    average velocity = 0 meters÷ 600 seconds
    average velocity = 0 m/s

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