What is the difference between average speed and instataneous speed?

Can average speed and instaneous speed by equal? Explain.

Give one physical difference between average velocity and instantaneous velocity.

What is the speed?

How is average speed obtained ?

How do you distinguish between average speed and root mean square speed of the molecules of a gas?

What is meany by average life of a radioactive element? Derive an expression for it. What is the relation between average life and half life?

In Exercises 3.13 and 3.14, we have carefully distinguished between average speed and magnitude of average velocity. No such distinction is necessary when we consider instantaneous speed and magnitude of velocity. The instantaneous speed is always equal to the magnitude of instantaneous velocity. Why ?