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The picture shows velocity-time graphs of movements of cars $A$, $B$, $C$ and $D$. Which of the cars speeds up with constant acceleration of $0.8\frac{\mathrm{m}}{{\mathrm{s}}^2}$? $$$$ Hint: An acceleration $a$ is the rate of change of velocity $\mathrm{\Delta }v$ of an object with respect to time $\mathrm{\Delta }t$, i.e. $a=\frac{\mathrm{\Delta }v}{\mathrm{\Delta }t}$.