- 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 rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?
Let $m$ be the mass of the rocket flying with a velocity $v$.
So, kinetic energy of the rocket, $K=\frac{1}{2}mv^2$
When the velocity of rocket is tripled suddenly, it becomes $3v$.
Therefore, kinetic energy $K'=\frac{1}{2}m(3v)^2$
$=\frac{9}{2}mv^2$
Now, $\frac{K}{K'}=\frac{\frac{1}{2}mv^2}{\frac{9}{2}mv^2}=\frac{1}{9}$
Or $K:K'=1:9$
Advertisements