You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same velocity?

Yes

Wait... maybe

To determine if both cars have the same velocity, we need to understand what velocity means. Velocity is a vector quantity that describes both the speed and direction of an object's motion. In this case, since the two cars are moving in opposite directions, their velocities will differ.

The car you are in is moving at a speed of 70 km/h in one direction, let's say towards the east. The other car passing you is also moving at a speed of 70 km/h but in the opposite direction, let's say towards the west. Therefore, their velocities have the same magnitude (70 km/h) but differ in direction.

Hence, the two cars do not have the same velocity.