# Is value of speed equal to the magnitude of velocity?

For example: - suppose a body covers a semi-circle in $5$ seconds, then distance$=\pi * r$, where $r$ is the radius of the semi-circle. Displacement is $2r$ only. Then the value of speed is $[\pi * r] / 5$ while that of velocity is $2r/5$. Here we can see that magnitude of velocity is different from that of speed. Is it correct?

• The displacement is $2r$ and the average velocity is $2r/5$. How do you claim $\pi∗r/5$ is the speed? – Mahdi May 6 '17 at 8:03