Position time graph of a body of mass 5 kg is given in the diagram The impulse on body at t = 3 s, is 


$$\begin{gathered} \left(1\right) 30 \hat{i} kg m{s}^{-1} \\ \left(2\right) -30 \hat{i} kg m{s}^{-1} \\ \left(3\right) 6\hat{i} kg m{s}^{-1} \\ \left(4\right) -6\hat{i} kg m{s}^{-1} \end{gathered}$$