A car initially at rest moves with a constant acceleration along a straight road. After its speed increases to 40km/hr it moves with a constant speed and finally retards uniformly .The time interval for the three parts of the journey are in the ratio 1:3:1. Find the average velocity of car.
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The average velocity of the car is equal to 32 km/hr
Explanation:
the average velocity can be defined as the ratio between the total distance covered by the total time taken to cover the distance.
- For determining the value we should draw a graph As given below.
- Let us consider the time ration as 1hr , 3hr and 1hr respectively
- The total distance is the area of the trapezium= 0.5x (5+3)x40= 160
- Now the total time which is taken is equal to 5hr.
- Hence the average speed is equal to 160/5km/hr = 32km per hr.
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