Final answer:
The relative velocity of two cars moving along a straight path with the same velocity is zero.
Step-by-step explanation:
The relative velocity of two cars moving along a straight path with the same velocity is zero.
When two objects are moving with the same velocity in the same direction, their relative velocity is zero. This means that they are not moving relative to each other.
For example, if both cars are moving east with a velocity of 40 m/s, their relative velocity would be zero.