Question

can someone explain me tangential velocity

Answer 1

@Michele_Laino

Answer 2

tangential velocity is a vector, which is tangent with respect to the trajectory of the particle in motion, and its magnitude v is equal to:
\[\Large v = \frac{{2\pi R}}{T}\]
where R is the radius of the trajectory (circumference) and T is time needed to our particle in order to complete 1 round of its trajectory. Of course, in my reasoning, I'm referring to a uniform circular motion of a particle.