A car travelled a certain distance with a speed of 50 km per hour and returns with a speed of 40 km per hour calculate the average velocity of car for the whole journey
Answers
Answer:12.50m/s
Explanation:
Speed= distance/time
S=50000m/3600s
S=13.88m/s————S1.
S=d/t
S=40000m/3600s————-S2
S=11.11m/s
Average speed = 13.88+11.11/2
=12.50m/s
Please Mark As The Branliest
A car travelled a certain distance with a speed of 50 km/hr and returns with a speed of 40 km/hr.
Let us assume that the distance covered by the car is x km.
Now,
Time = Distance/Speed
t1 = x/50 hr
t2 = x/40 hr
We have to find the average velocity of the train.
Average speed is defined as the ratio of total distance covered with respect to total time taken. Whereas average velocity is defined as the ratio of total displacement with respect to total time taken.
As, the distance covered by the car is same. Also, the car returns back to it's starting point again using the same pathway. Means the initial and final points of the car are same. So, the total displacement of the car is zero.
Total time taken by car = t1 + t2
= (x/50 + x/40) hr
Average velocity = (Total displacement)/(Total time taken)
= 0/(x/50 + x/40)
= 0
Therefore, the average velocity of the car is 0 km/hr.