. Two bodies have undergone an elastic one–dimensional collision along x–axis
Figure shows six lines corresponding to position versus time curve of both bodies and their centre of mass before and after the collision. The line segments corresponding to the motion of center of mass before and after the collision are
(a) CP and PF (b) BP and PE (c) AP and PD (d) BP and PF
Correct option is B
From the graph it can be concluded that velocities are either positive or zero so velocity of centre of mass will lie between the velocities of bodies so it has to be given by slope of BP. Now since velocity of centre of mass does not change due to collision so it will be given by PE.