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The velocity of the car remains constant throughout the journey.
The change in speed alone causes the velocity of the car to vary.
The change in direction alone causes the velocity of the car to vary.
The velocity of the car changes due to the change in speed and direction.

The velocity of the car changes due to the change in speed and direction.

The statement "The velocity of the car remains constant throughout the journey" is False.

To understand why, let's break down each statement:

1. The velocity of the car remains constant throughout the journey.
To determine if this statement is true, we need to know if the car's speed and direction stay the same. If both speed and direction remain constant, then the velocity will indeed remain constant. However, if either the speed or the direction changes, the velocity will vary. So, if there is any change in speed or direction during the car's journey, this statement is false.

2. The change in speed alone causes the velocity of the car to vary.
This statement is True. Velocity is a vector quantity that considers both speed (magnitude) and direction. If the car's speed changes while the direction remains constant, the velocity will also change. For example, if a car slows down or speeds up along a straight path, its velocity will vary.

3. The change in direction alone causes the velocity of the car to vary.
This statement is True. Similarly, if the direction changes while the speed remains constant, the velocity will also change. For instance, if a car turns left or right without changing its speed, the velocity will vary.

4. The velocity of the car changes due to the change in speed and direction.
This statement is True. When both the speed and direction of the car change simultaneously, the velocity will definitely vary. For example, if a car accelerates while turning, the velocity will change due to the combined effect of the change in speed and direction.

In summary, the first statement is False as the velocity of the car can change due to changes in speed or direction, or both.

The velocity of the car changes due to the change in speed and direction. When the car undergoes a change in speed, it means that either its acceleration or deceleration is changing. This affects the car's velocity, as it is a vector quantity that takes into account both the magnitude (speed) and direction of motion. Similarly, when the car changes direction, it means that the angle or orientation of its path is changing. This also affects the car's velocity, as it involves a change in both the direction and speed of the car's motion. Therefore, both the change in speed and change in direction can cause the velocity of the car to vary. However, if the car's speed remains constant but the direction changes, the velocity will still vary due to the change in direction alone.