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प्रश्न
A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 20 m in 25 seconds to reach the bookshop. After buying a book, he travels the same distance in the same time to reach back in the classroom. Find (a) average speed, and (b) average velocity, of the boy.
उत्तर
a) Distance travelled is the length of the actual path covered.
Total distance covered in going and coming back :
= (20 + 20) m
= 40 m
Total time taken, = (25 + 25) s
= 50 s
So, we can calculate average speed as :
`"Average Speed" = "Total distance travelled"/"Time"`
Average speed for the entire journey ;
= `40/50`
= 0.8 m/s
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