A man skateboards on a straight road from his hostel to a mall 2km away at a speed of 4km/h. Find the mall closed, he instantly returns back to his hostel at a speed of 6km/h. Calculate the magnitude of average velocity and the average speed of the man over the time interval of (i) 0 to 30 minutes (ii) 0 to 50 minutes.
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Answer:
Explanation:
1)avg.speed=total dist / total time
Total distance=2+2=4km
Total time =time home to market +time market to home
=2/4+2/6
0.83
Avg speed =4/0.83=4.8kmperhour
2)avg vel=0 since total displacement is 0
3)in 30 min the boy travelled 2km =4kmperhour
In40 min he travelled 2+1=3km
Avg speed=3/1.5=2kmperhour
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