1.

A person travels along a straight road for the first half time with a velocity v1 and the second half time with a velocity v2. Then the mean velocity vis given by​

Answer»

Let the total DISTANCE be d. Time taken for the FIRST half half distance is t  1 ​   =  2V  1 ​    d ​    Time taken for the second half of the distance is t  2 ​   =  2v  2 ​    d ​     MEAN velocity =  total time total distance ​    v  mean ​   =  2v  2 ​    d ​   +  2v  1 ​    d ​    d ​    v  mean ​   =  v  1 ​   +v  2 ​    2v  1 ​   v  2 ​    ​    ⇒  v  mean ​    2 ​   =  v  1 ​    1 ​   +  v  2 ​    1 ​    GIVEN, v  mean ​   =v ⇒  v 2 ​   =  v  1 ​    1 ​   +  v  2 ​    1 ​   Explanation:



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