Human beings can observe and perceive the effects of acceleration and velocity, although they might not directly measure or quantify them using the specific mathematical symbolism you mentioned (v/t and d/t).
Acceleration, which is the rate of change of velocity, can be perceived by humans through the sensation of being pushed or pulled. For example, when riding in a car that accelerates or decelerates quickly, individuals can feel the force exerted on their bodies, indicating a change in velocity.
Velocity, on the other hand, can be perceived in terms of relative speed and direction. For instance, when walking or running, individuals have a sense of their own speed and the direction in which they are moving.
While humans have an innate ability to perceive and estimate changes in velocity and acceleration, accurately measuring these quantities requires the use of instruments and more precise mathematical techniques. Instruments like speedometers, accelerometers, and GPS devices provide objective measurements of velocity and acceleration, allowing for more accurate quantification of these physical quantities.
In summary, while humans can perceive the effects of velocity and acceleration, measuring and quantifying them precisely require specialized instruments and mathematical techniques beyond the simple v/t and d/t notation.