Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Motion in a Plane
+1 vote

The police are chasing a bank robber.While driving at 50m/s,they fire a bullet to shoot out a tire of his car.The police gun shoots bullets at 300m/s.What is the bullet's speed as measured by a TV camera crew parked beside the road?

$\begin{array}{1 1}350m/s\\450m/s\\250m/s\\150m/s\end{array} $

Can you answer this question?

1 Answer

0 votes
Answer : 350m/s
Note: Let's assume that all motion is along the x-axis. Let the earth be frame S and a frame attached to the police car be S'.Frame S' moves relative to frame S with $V_x=50m/s$
If we know an object's velocity measured in one reference frame,S,we can transform it into the velocity that would be measured by an experimenter in a different reference frame, $\overrightarrow{v}=\overrightarrow{v'}+\overrightarrow{V}$ or $\overrightarrow{v'}=\overrightarrow{v}-\overrightarrow{V}$
The bullet is the moving object that will be observed from both frames.The gun is in frame S',so the bullet travels in this frame with $v_x'=300m/s$.
We can transform the bullet's velocity into the earth reference frame :$v_x=v_x'+V_x$
answered Aug 13, 2014 by sreemathi.v
edited Aug 13, 2014 by balaji.thirumalai

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App