A $4\text{ kg}$ mass moves under the influence of a force $\vec{F} = \left( 4t^3\hat{i} - 3t\hat{j} \right)\text{N}$ where $t$ is the time in second. If mass starts from origin at $t = 0$, the velocity and position after $t = 2\text{s}$ will be:
$ \vec{v} = 3\hat{i} + \frac{3}{2}\hat{j} \qquad \vec{r} = \frac{6}{5}\hat{i} + \hat{j} $
$ \vec{v} = 4\hat{i} - \frac{3}{2}\hat{j} \qquad \vec{r} = \frac{8}{5}\hat{i} - \hat{j} $
$ \vec{v} = 4\hat{i} - \frac{3}{2}\hat{j} \qquad \vec{r} = \frac{6}{5}\hat{i} - \hat{j} $
$ \vec{v} = 4\hat{i} + \frac{5}{2}\hat{j} \qquad \vec{r} = \frac{8}{5}\hat{i} + 2\hat{j} $