2.1 Linear Motion

Distance is defined as the total length of the path traveled by an object from one point to the other.

Displacement is defined as the shortest length between two points in a specific direction.

Speed is defined as the rate of change of distance.

\[
\begin{aligned}
v & =\frac{d}{t} \\
v & =\text { speed } \\
d & =\text { distance } \\
t & =\text { time }
\end{aligned}
\]

\[
v=\frac{\text { Total distant traveled, } s}{\text { Total time taken }, t}
\]

Velocity is defined as the rate of change of displacement.

\[
\begin{aligned}
v &=\frac{s}{t} \\
v &=\text { speed } \\
s &=\text { displacement } \\
t &=\text { time }
\end{aligned}
\]

Acceleration is defined as the rate of change of velocity.

\begin{align}
a &=\frac{v-u}{t} \\
a &=\text { acceleration } \\
v &=\text { final velocity } \\
u &=\text { initial velocity } \\
t &=\text { time }
\end{align}

Deceleration is the rate of decrease of velocity or how fast a velocity of a moving object decreases.