Question

a car moving at the speed of 50 km/hr returns with speed of 40 km/hr. what is the average velocity of the car​

Answer 1

Answer:

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Explanation:

Speed = 40 km/ hr. Time taken = x / 40 hr. = 4000/90 = 44.44 km/ hr. Answer: Average speed 44.44 km/ hr.

Answer 2

Answer:

Explanation:

Given:-

Speed in the forward direction,v1 = 50km/h

Speed during the return journey,v2=40km/h

To Calculate:-

Average speed, v(avg) =??

Formula to be used:-

v(avg) = Total distance/Total time taken

Solution:-

Now in this case we are neither given the total distance nor the total time taken.

Let us say the distance traveled in the forward direction be x

Total Distance,d= x+ = 2x

Time taken during forward jouney, t1 = x/50 h

Time taken during the return journey,t2= x/40 h

Total time taken,t = x/50 + x/40 = 9x/200 h

Now,

v(avg)= Total distance/Total time taken

= v(avg) = 2x/9x/200

= v(avg) = 2x x 200/9x

= v(avg) = 400/9

= v(avg) = 44.44km/h

Hence the average speed of the whole journey is 44.44 km/h