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Dear Student,

From graph, we know one point is (0,2) and (2,4)

Equation of line (x represent time and y represent velocity)

$$\begin{gathered} y=\frac{y_2-y_1}{x_2-x_1}(x-x_1) +y_1 \\ U\sin g it, we get \\ y=\frac{4-2}{2-0}(x-0)+2 \\ y=x+2 \\ Putting x=9 in equation, we get \\ y=11 \end{gathered}$$

So velocity is 11m/s.


Regards,