The momentum of an object is calculated by multiplying its mass by its velocity. In this case, the momentum of the 800kg car traveling at 20 m/s would be 16,000 kg m/s. Momentum is a vector quantity, meaning it has both magnitude and direction, which in this case would be in the direction of the car's motion.
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100 Kg m/s
Momentum = (mass ) x (velocity) = (5) x (4) = 20 kg-meters/sec in the direction of the velocity.
Momentum = mass * velocity. If both cars have the same mass, then the faster one will have more momentum. Probably the slow car doesn't weigh 5 times as much as the fast one, so the fast one most likely has more momentum.
Depends how fast you are traveling. On a highway,about 15- 20 min.
20 m/s