A man walks on a straight road from his home to the market 2.5 km away with a speed of 5km/hr.Finding the market closed,he instantly turns and walks back home with a speed of 7.5 km/hr. What is the a) magnitude of average velocity and b) average speed of the man over the interval of time (i) 0 to 30 min , (ii) 0 to 50 min, (iii) 0 to 40 min

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