Important point about verification of conservation of momentum before we go off to simulation land.
During the time of Newton, experimental verification of this fundamental tenet was not possible due to the lack of accurate instrumentation
Had Galileo been able to do this rigorously, he might have been available to develop much of Newtonian mechanics.
The problem is that conservation of momentum is difficult to see in every day life because of the role of friction in the real world.
The basic rule:
Total momentum before the encounter = total momentum after the encounter.
Momentum = mass x velocity = mv.
Now let's apply this.
Fill in your results in the worksheet labeled momentum.
Newtonian Mechanics works well in most of the real world and it does allow us to blow up our enemies.