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It states “The total momentum of a system of
masses or moving bodies in any direction remains
the same, unless it is acted upon by some
external force in that direction.”
If two masses m1 and m2
moving with linear velocities v1 and
v2 moving in the same collides then
they start moving with the same velocity v.
i.e. momentum before collision = momentum after
collision
m1v1 + m2v2
= (m1+m2) v
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