Final answer:
The car's speed is 0.02 km per second. The car's velocity is also 0.02 km/s, but it is directed due east. The detailing of direction distinguishes velocity from speed.
Step-by-step explanation:
The car's speed can be calculated by dividing the distance covered by the time taken. This is because speed is the measure of how fast something is moving. In this case, the car moved 2 km in 100 seconds. Therefore the speed of the car is 2 km/100 s = 0.02 km/s.
Speed is a scalar quantity because it only has magnitude.
Velocity, on the other hand, is a vector quantity because it has both a magnitude (speed) and a direction. So, in this case, the velocity of the car is 0.02 km/s due east, because the car is moving on a straight path due east.
Learn more about Speed and Velocity