a car travels a distance from A to B at a speed of 60 km/h and returns A at a speed of 30 km/h. what is the average speed for the whole journey? what is the average speed velocity of the car?
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Answer:
Explanation:
Average speed = total distance travelled/ total time.
Let distance from A to B be x.
Average speed = 2 x / (x/60 + x/30 )
= 2 /( 1 + 2)/60
= 120/3
= 40 km/hr
Average velocity = total displacement / total time.
Total displacement = 0, avg velocity = 0.
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