A person travelling on a straight line moves with a uniform velocity u1 for some time and with uniform velocity u2 for the next equal time. The average velocity u is given by

Let the time be t corresponding to both uniform velocities u1 and u2. Since, the velocities are uniform, the acceleration is zero.


Let the distance covered be d1 and d2 corresponding to uniform velocities u1 and u2 respectively and thus






1