Question

A car travels from Bangalore to Mumbai and returns back in $20hours$. What is the average velocity and average speed of the car if odometer reading of the car, when it started was $2200km$ and when finished was $3800km$?

• A. Average Velocity = $0kmph$,
  Average Speed =$0kmph$
• B. Average Velocity = $0kmph$,
  Average Speed = $80kmph$
• C. Average Velocity = $80kmph$,
  Average Speed = $0kmph$
• D. Average Velocity = $80kmph$,
  Average Speed = $80kmph$

Answer 1

The correct option is B Average Velocity = $0kmph$,

Average Speed = $80kmph$
Given, displacement of the car = $0$
(as initial position is same as final position )
When the car started the journey, the odometer reading was $2200km$ and when the car finished the journey, the odometer reading was $3800km$.
$\therefore$ Distance covered = $3800-2200=1600km$.
Time taken = $20hours$.

We know:
$\text{Average velocity}=\frac{Totaldisplacement}{Totaltime}$

$\text{Average velocity}=0kmph$

$\text{Average speed}=\frac{Totaldistance}{Totaltime}$

$\text{Average speed}=\frac{1600}{20}=80kmph$

$\therefore$ Average velocity of the car is $0kmph$ and average speed of the car is $80kmph$.