A 2 kg toy car can move along an x axis. Graph shows force ${\mathrm{F}}_{\mathrm{x}}$, acting on the car which begins at rest at time t = 0. The velocity of the particle at t = 10 s is:

$\int \mathrm{dp} = {\mathrm{p}}_{\mathrm{f}}-{\mathrm{p}}_{\mathrm{i}} = \int \mathrm{F} \mathrm{dt}$

        = Area under the curve

          ${\mathrm{p}}_{\mathrm{i}} = 0$

Net area = 16-2-2 = 12 N-s

              = ${\mathrm{V}}_{\mathrm{f}} = \frac{13}{2} = 6 \hat{\mathrm{i}} \mathrm{m}/\mathrm{s}$

[As momentum is positive, particle is moving along positive x axis.]