A bus travels for a certain time. Its speed during the first half time is v1 and that during the second half time is v2. The average speed during the whole journey is

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Mechanics is the area of mathematics and physics concerned with the relationships between force, matter, and motion among physical objects. Forces applied to objects result in displacements or changes of an object's position relative to its environment.


A bus travels for a certain time. Its speed during the first half time is v1 and that during the second half time is v2. The average speed during the whole journey is