Explain the relationship between velocity and acceleration. are these scalar or vector quantities?

According to newton's second law: F=MA

Or, force equals mass times acceleration.

Scalar quantities are measurements WITHOUT a direction. Example, speed. Speed measures how fast you are going, but not what direction you are going. Therefore mass is considered a scalar since you can measure how much mass an object has, but since the mass doesn't have to be moving it does not have an associated direction.

Conversely, velocity is a vector. Vectors are measurements WITH a direction. Velocity by definition is speed in a direction therefore by definition it is a vector. Acceleration is defined as change in velocity over a change in time and therefore is also a vector.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

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