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Momentum is the product of the mass of and object and its velocity.

Mathematically expressed as  p = mv.
                                      where p(rho) = momentum in kg m/s or Ns (Newton second)
                                                m  = mass in kg.
                                                v = velocity in m/s

So we have:

          p = 0.5kg x 5.0 m/s
             = 2.5 Ns  ANSWER
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