An impulse force on the $\textrm{x-axis}$ direction acts on a body whose mass is $2\,kg$ as shown in the graph from below. Using this information assign True or False to the following statements.

I. The impulse given to the body is $+72\,Ns$.

II. The average impulse force is approximately $514\,N$.

III. The body has an initial speed of $-16\,\frac{m}{s}$ and its final speed is $+20\,\frac{m}{s}$.

$\begin{array}{ll}

1.&FFF\\

2.&FTF\\

3.&TFT\\

4.&TTT\\

5.&TTF\\

\end{array}$

I'm confused exactly on how can I tell the average impulse force and how to find the initial and final speeds from the graph. Can somebody help me with these?.

The only thing which I was able to find was that impulse is the area below the curve, which in this case will be given by:

$J=\frac{\left(14+4\right)\times 8}{2}=+72\,Ns$

But that's it where I'm stuck. Can somebody help me?.