What is the total momentum of the system before collision If two 0.5 kg balls approach each other with the same speed of 1.0 ms?

What is the total momentum of the system before collision If two 0.5 kg balls approach each other with the same speed of 1.0 ms?
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Answer :

Momentum is mass times velocity. But in this case, you don'teven need to calculate that: If I understand correctly, the ballshave the same mass, the same speed, and they move exactly inopposite directions - so any momentum from one ball is exactlyoffset by the momentum of the other ball. In other words, if oneball has a momentum of +M, the other one will have a momentum of-M.
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