Question

write the derivation of conservation of momentum

Answer 1

On a system external force is zero,
F = ∆p/∆t
0 × ∆t = ∆p
∆p = 0
p = constant

Then,
$m_{1} u_{1} = m_{1} v_{1}$

Answer 2

This pic help you ^

:)The law of conservation momentum state that the momentum will remain constant until and unless any external force comes into action.

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Hope this is helpful for u :)