Physics - NLM Question with Solution | TestHub

Area under the F-t graph gives change in momentum. Since the body is initially at rest, it gives the momentum of the body after 1 second. $$\begin{array}{rl}& \text{ Area }=10\times 0.5+20\times 0.5=5+10=15\mathrm{N}-\mathrm{s}\\ & \therefore \mathrm{mV}=15\mathrm{N}-\mathrm{s}\\ & \mathrm{V}=\frac{15}{\mathrm{m}}=\frac{15}{2}=7.5\mathrm{m}/\mathrm{s}\end{array}$$