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23/10/2021 5:47 pm
Topic starter
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.
1 Answer
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23/10/2021 5:50 pm
(a) Total distance covered in going to the bookshop and coming back to the classroom = 20 + 20 = 40m
Total time taken = 25 + 25 = 50 sec
Average speed = \(\frac{Total\;distance}{Total\;time}\)
= \(\frac{40}{50}\)
= 0.8 m/s
(b) Average velocity = \(\frac{Total\;displacement}{Total\;time}\)
= \(\frac{0}{50}\) = 0 m/s