Question

A person travels along a straight row fpr the first half lengyh with a velocity v1 and the second half lengthwith v2 what is d mean velocity of d person

Answer 1

let the half lengths be x each, displacement = S.

given that he travels first half is x/2 with v1.

Displacement = v1 * x/2

Given that he travels second half is x/2 with v2. Displacement = v2 * x/2.

So, S = v1 * x/2 + v2 * x/2 = (x/2)(v1+v2)

  Average velocity = S/x

                               = (x/2)(v1+v2)/x

                              = (v1+v2)/2.