**Question 1**:

The diagram
above shows the distance-time graph of a moving particle for 5 seconds. Find

**(a)**the distance travel by the particle from the time 2 second to 5 second.

**(b)**

**the speed of the particle for the first 2 seconds.**

*Solution:***(a)**

Distance
travel by the particle from the time 2 second to 5 second

= 20
– 15

=

**5 m****(b)**

The
speed of the particle for the first 2 seconds

=
Gradient

$\begin{array}{l}=\frac{15-0}{2-0}\\ =7.5{\text{ms}}^{-1}\end{array}$
**Question 2**:

The
diagram above shows the distance-time graph of a moving car for 12 seconds. Find

**(a)**

**the value of v, if the average speed of the car for the first 6 seconds is**

2 ms

^{-1}.

**(b)**

**average speed of the car for the first 8 seconds.**

*Solution:***(a)**

Average speed of the car for the first 6 seconds is 2 ms

$$\begin{array}{l}\frac{\text{Totaldistancetravelled}}{\text{Totaltimetaken}}=2\\ \frac{v}{6}=2\\ v=12\end{array}$$^{-1}**(b)**

Average
speed of the car for the first 8 seconds