<s>[INST] A particle is moving along a straight line and its velocity $v$ varies with time $t$. Given that the velocity at time $t = 0$ is $v_0$, the acceleration $a$ is constant and is equal to 2 m/s^2, and at $t = 1$ second the velocity is $v_1$, what is the velocity $v$ when $t = 2$ seconds?[/INST]