Question

# A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 20 m is 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. Find (a) average speed, and (b) average velocity, of the boy.

Solution

## 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 Distance from classroom to bookshop = 20m Time = 25sec After buying a book, he travels the same distance at the same time to reach back into the classroom. (a) Average speed =  Total DistanceTotal Time = 20+2025+25 = 4050 = 0.8 m/s (b) Average velocity=  DisplacementTime  As displacement is the shortest path between source and destination. Here, displacement = 0, because child travels 20m forward and travels 20 m backward. Displacement = 20 - 20 = 0 Hence, average velocity = 050 = 0 m/s PhysicsScience for Ninth Class - Part I - PhysicsStandard IX

Suggest Corrections
Â
0

Similar questions
View More

Same exercise questions
View More

People also searched for
View More