Answer:
The correct answer is option B which is 0.2 kg m/s.
Step-by-step explanation:
According to the law of conservation of a momentum, the total momentum of the system before colliding the the two moving balls and after colliding the balls must be equal.
The momentum of an moving object is the product of mass and velocity.
Momentum before collision = m1v1 + m2v2
By putting values in the above formula:
Total momentum : 0.6 × 0.5 + 0.5 × -0.2
= 0.3 -0.1 = 0.2 Kg m/s
Hence the correct option is B.