Question

Two particles approach each other with different velocities. After collision , one of the particles momentum $\overrightarrow{p}$ in their center of mass frame. in the same frame, the momentum of the other particles.

• A. 0
• B. $-\overrightarrow{p}$
• C. $-\overrightarrow{p}/2$
• D. $-2\overrightarrow{p}$

Answer 1

The correct option is B $-\overrightarrow{p}$

If there is no external force hence the momentum will be conserved in the frame of centre of mass so the momentum in the frame of reference is 0. As given if one's momentum after collision is p.

then the other one's momentum will be −p.