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The momentum of a car can be calculated by multiplying its mass (in kg) by its velocity (in m/s).
Momentum = mass × velocity
Given that the car has a mass of 2,000 kg and is moving at a constant velocity of 20 m/s, we can calculate its momentum:
Momentum = 2,000 kg × 20 m/s
Momentum = 40,000 kg·m/s
Therefore, the correct answer is 40,000 kg·m/s.