Which function is symmetric with respect to the origin?

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The problem above may be solved through the concept of conservation of momentum such that, 
                                      m₁v₁ = m₂v₂
Substituting the given from the problem above,
                                  (0.145 kg)(20 m/s) = (0.145 kg + 120 kg)(v₂)
                                     v₂ = 0.024 m/s
Therefore, the answer is 0.024 m/s.