Physics · JEE | LAWS OF MOTION

In an isolated system of interacting particles, if \( \mathbf{p}_A \) and \( \mathbf{p}_B \) are initial momenta and \( \mathbf{p}'_A \) and \( \mathbf{p}'_B \) are final momenta after collision, the law of conservation of momentum implies:

1. A
   \( \mathbf{p}'_A + \mathbf{p}'_B = \mathbf{p}_A + \mathbf{p}_B \)
2. B
   \( \mathbf{p}'_A - \mathbf{p}'_B = \mathbf{p}_A - \mathbf{p}_B \)
3. C
   \( \mathbf{p}'_A + \mathbf{p}_A = \mathbf{p}'_B + \mathbf{p}_B \)
4. D
   \( \mathbf{p}'_A \mathbf{p}'_B = \mathbf{p}_A \mathbf{p}_B \)