Two bodies of mass 1kg and 2kg respectively moving in the directions opposite to each other with a speed 5m/s collide. Calculate the total momentum of the system before collision.

[m1] [u1] + [m2] + [u2]
=1*5+2*5
=5+10
=15
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Please solve it answer is
-4kgm/s
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Two bodies of mass 1 kg and 2kg respectively moving in the direction opposite to each other with speed V metre per second collides calculate the total momentum of the system before collision
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