The force ‘F' acting on a particle of mass ‘m' is indicated by the...

As we know that:-

Area under force-time graph gives as momentum

$∆ P =$ar of given curve

$∆ P = \dfrac{1}{2} \times b \times h + {l}_{1} \times {b}_{1} + {l}_{2} \times {b}_{2}$

$∆ P = \left(\dfrac{1}{2}\right)\left(2\right)\left(6\right) - \left(3\right)\left(2\right) + {\left(4\right)}^{2}\left(3\right)$
$= 6 - 6 + 12$
$= 12$