A boy walks on a straight road from his home to a market 2.5 km with a speed of 5 dm h -1 . Finding the market closed he instantly turns and walks back with a speed of 7.5 km h -1 . What is the average speed and average velocity of the boy between t = 0 to t = 50 min?
Text Solution
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Time taken by the boy to go from his home to the market, 
Times taken by the boy to return back from the market to his home, 
Total times taken
In t = 0 to 50 min
Total distances travelled = 
= 5 km
Displacement = 0 (As the boy returns back home)
Average speed
Average velocity 
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