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A 4kg mass traveling eastwards at 4m.s per second collides with a 3kg mass traveling westward as 8m.s per second..calculate the total momentum of mass before they colide

Verified Answer :

The following instructions are my idea.

P=mv

1. notice that the to masses move in opposite directions -> one has positive and one has negative speed

2. P1=4(-4)=-16[kgm/s]
P2=38=24[kgm/s]
3. Add the momentums:

P1+P2=-16+24=8[kgm/s]

The total momentum of mass equals 8 kg*m/s

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