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?
Answers & Comments
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
average speed = 7km ÷ 3 hours
average speed = 2.33 km/hr
average speed = 9.5 km ÷ 3 hours
average speed = 3.17 km/hr
average velocity = 0 meters÷ 600 seconds
average velocity = 0 m/s