The correct way to represent the calculation of momentum \( P = mv \) with the given values would be:
\[ P = (9 , \text{kg}) \times (5 , \text{m/s}) = 45 , \text{kg} \cdot \text{m/s} \]
So, the correct response is:
45 kg*m/s=(9 kg) (5 m/s)
This matches the first option you provided.