Question

A car starts from Chennai to Mumbai and returns back to Chennai again in 20hrs. What is the average velocity and average speed of the car if odometer reading of the car, when it started was 4200 km and when finished was 5000 km?

• A. Average Velocity : 0km/hr, Average Speed : 0 km/hr
• B. Average Velocity : 0km/hr, Average Speed : 80 km/hr
• C. Average Velocity : 80km/hr, Average Speed : 80 km/hr
• D. Average Velocity : 80km/hr, Average Speed : 0 km/hr

Answer 1

The correct option is B

Average Velocity : 0km/hr, Average Speed : 80 km/hr

Displacement = 0 ( as initial position is same as final position )
So, Average Velocity =0;
Distance = 5000 - 4200 = 800km
Average Speed = $\frac{800}{20}$ =$40\frac{km}{hr}$