Answer:
For
bullet
[By convention, the direction of bullet is taken from left to right
(positive)]
For pistol
Total momenta of the pistol and bullet before the fire
Total momenta of the pistol and bullet after the fire
According to the law of conservation of momentum, Total
momenta after fire = Total momenta before the fire
(1)
Negative sign indicates that the direction in which the
pistol would recoil is opposite to that of bullet (right to left),
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