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The momentum of an object can be calculated using the formula:
\[ \text{Momentum} (p) = \text{mass} (m) \times \text{velocity} (v) \]
For a car with a mass of 1,900 kg moving at a velocity of 20 m/s, the momentum would be:
\[ p = 1,900 \, \text{kg} \times 20 \, \text{m/s} = 38,000 \, \text{kg.m/s} \]
Therefore, the correct response is:
**38,000 kg.m/s**