The objects collide together where one object is exerting force on the other in equal and opposite magnitude. When they stuck together, their final momentum will be the sum of initial of momentum of each object. Thus, the final momentum after collision will be 16 kg m/s.
Momentum is a physical quantity which is equal to the product of mass and velocity of the object. Hence, for a stationary body, the there will be no momentum.
During collision, the total momentum is conserved. Thus, the sum of initial momentum of the colliding objects is equal to the final momentum of the combined mass.
The momentum of object 1 = 12 Kg m/s
object 2 = 4 kg m/s.
Thus, total initial momentum = final momentum = 12 + 4 = 16 Kg m/s.
Therefore, the final momentum after collision is 16 Kg m/s.
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