What is rectilinear motion?

What is kinematics? 

What is required to specify the position of an object?

What is meant by path length? 

 What is displacement? 

What is meant by uniform motion?

What is the position - time graph?

Define average velocity.

Define average speed.

Define instantaneous velocity of a body in terms of its average velocity.

The average velocity of a body is equal to its instantaneous velocity. What do you conclude by this?