A boy runs on straight road from his home to a market 2km away with a speed of 4km/h finding the market close he at once runs back to his home with a speed of 6km/h . Calculate his average speed, magnitude of average velocity and average speed of the boy in the time interval 0to 30min and 0to 40min
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Answer:
)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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