NEET 2014 Physics and Chemistry

Try to understand the graph given in the question and see what details it can give us. We have a force-time graph where we have the change of force with time. We need to find the change in momentum. For it we need to multiply the force with the time interval. From the graph we can find this value by finding the area under the curve.
Complete step by step answer:
A particle of mass m is subjected to a force F. change in force with time is given by the graph in the question.
change in momentum of the particle is given by the area under the curve.
Change in momentum is equal to
=‌

1

2

×2×6+(−3)×2+3×4
=6−6+12 =12
So, the change in momentum of the particle is 12Ns