question_answer

A person travels along a straight road for the first half length with a velocity \[{{\upsilon }_{1}}\] and the second half length with velocity \[{{\upsilon }_{2}}\]. What is the mean velocity of the person?

Answer:

                In 2 minutes 20 seconds, an athlete will complete =\[\frac{2\times 60+20}{40}=3.5\]round, i.e., three complete rotations and one half rotation, i.e., finally it will be at the opposite end of the diameter from the starting point. So displacement = 2R.