Bumper cars A and B undergo a collision during which the momentum of the combined system is conserved.
Which equation(s) correctly states the principle of conservation of momentum?
1. P⃗ A, i+P⃗ B, i=P⃗ A, f+P⃗ B, f
2. P⃗ A, i+P⃗ A, f=P⃗ B, i+P⃗ B, f
3. ΔP⃗ A=ΔP⃗ B
4. ΔP⃗ A+ΔP⃗ B=0
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