The Total solution for NCERT class 6-12
In Exercises 3.13 and 3.14, we have carefully distinguished betweenaverage speed┬аand magnitude of average velocity. No such distinction isnecessary when weconsider the instantaneous speed andthe magnitude of velocity. The instantaneous speed┬аis always equal to themagnitude of instantaneous velocity. Why?
Instantaneous velocityand instantaneous speed are equal for a small interval of time because themagnitude of the displacement is effectively equal to the distance travelled bythe particle.