The speed stays at a constant 2.0 m/s for the whole time. Changing direction at B does not affect speed because it is a scalar quantity.

The velocity stays constant at 2.0 m/s east for the first 6.0 s as the displacement vector increases in magnitude to the east.

At point B the direction will change. Velocity is a vector quantity and therefore direction is important to it. So if the direction changes, so must the velocity. [br][br]At B the cars displacement becomes the largest east value it will ever be. [br][br]After B the car's displacement to the east will decrease. We can also say that the car's displacement to the west is increasing. [br][br]At 12 s the displacement from the start (reference point) is 0 m and therefore a velocity of 0 m/s. After passing the start at 12 s, the displacement continues increasing to the west.

Average velocity is always measured from the reference point. That is why, even at 10 s the average velocity is to the east. The displacement is to the east and if you were to start at the reference point you would need to go east to get there.[br][br]Instantaneous velocity is the velocity at the instant that you choose to measure. In this case, at 10 s, your instantaneous velocity will be 2.0 m/s west because that is the direction it is going. We will talk about instantaneous velocity more later.