A large stone is falling through a layer of mud. At time t
t seconds, the depth of the stone in metres below the surface is given by:  $x\left(t\right)\ =\ 20\ \left(1-e^{\frac{-t}{2}}\right)$  . What is $\frac{\text{d}v}{\text{d}t}$  ?

Acceleration is defined as

The following is the assumption taken when deriving Newton's equation of Motion.

The distance taken by the particle at a constant acceleration is the same as the area under;

The velocity-time graph of a DES II student moving along a straight line is given below. Find his average velocity.

Write all the terms used in the equations of motion (Separate all of them by commas and finally by "and". Use one word for each stated term).