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? check all that apply. check all that apply. p⃗ a, i+p⃗ b, i=p⃗ a, f+p⃗ b, f p⃗ a, i+p⃗ a, f=p⃗ b, i+p⃗ b, f δp⃗ a=δp⃗ b δp⃗ a+δp⃗ b=0