![Trending Articles on Technical and Non Technical topics](/images/trending_categories.jpeg)
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
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 $=\frac{total\ displacement}{total\ time}$
$=\frac{0}{50\ s}=0$
Advertisements