As you can tell from the form of v=f(t)=2*t m/s , velocity will increase linearly with time. This is shown on the display. At any value of time, t, along the horizontal axis, the value of acceleration is 2 and the value of velocity is 2*t. What may be less obvious is that at any t, the value of velocity is equal to the area under the acceleration curve, here a flat line, between zero and the time t. This makes sense when you think about it. Acceleration is a rate of change of velocity, so based on the units, if I multiply the change in velocity with respect to time, by time, the result will have units of velocity. On a plot of velocity versus time, as we have here, the area under the acceleration curve is exactly that, the product of acceleration times time.