A boy walks to his school at a distance of 6km with a speed of 3km/h and walks back with a constant speed of 2km/h. His average speed for round trip in km/h is:
Correct answer: B. 2.4
- A. 2.5
- B. 2.4
- C. 5
- D. 2.3
Explanation
We find out the average speed by using2v1v2/(v1+v2) = 12/5 = 2.4 km/h
This question appeared on the ETEA MDCAT 2017 paper, which you can sit online with every answer explained.
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Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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