A car goes from a to b from the speed of 120 km per hour and return from b to a by 80 km per hour.What is its average speed for total journey
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Explanation:
Velocity - Velocity is speed with Direction or in another words Displacement by time taken. So if a vehicle starts at A and Ends back at point A then the displacement is 0 hence the velocity is 0.
Speed - Assuming the distance between A to B while going from A to B is x kms
Case 1 - The Car goes returns from B to A via the same exact route it went from A to B. So the Average Speed will be total distance travelled by total time taken so .
Total Distance = x + x = 2x
Total Time = x/60 hrs + x/90 hrs = 3X+2X/180 = 5X/180
Average Speed = 2X*180/5X = 360/5 = 72km/hr
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