Which of the following is not a vector?

The correct choice indicates that area is not a vector. In physics, a vector is defined as a quantity that has both magnitude and direction. Examples of vectors include velocity, which describes the speed and direction of an object; force, which involves a push or pull characterized by both how strong the force is and the direction it acts in; and acceleration, which measures the change of velocity per time and is also directional.

Area, on the other hand, is a scalar quantity. It measures the extent of a surface in two dimensions and is represented solely by its size (magnitude), without any reference to direction. Therefore, area does not fulfill the definition of a vector, making it the correct answer to the question regarding which option is not a vector. Understanding the distinction between scalar and vector quantities is crucial in physics and mechanics, particularly when dealing with forces and motion.