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.

$(a)$. As given, the 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 at the same time to reach back in the classroom.

Here, Total distance travelled$=20\ m+20\ m=40\ m$

Total time taken$=25\ s+25\ s=50\ s$

Therefore, average speed$=\frac{total\ distance}{total\ time}$

$=\frac{40}{50}=0.8\ m/s$

$(b)$. Here, displacement $=20\ m-20\ m=0$

Therefore,  average velocity $=\frac{total\ displacement}{total\ time}$

$=\frac{0}{50\ s}=0$

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Updated on: 10-Oct-2022

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