Relativity, Physics, Math, Einstein, Spacetime.
from equations (5), if we calculate the velocity of another point of K’ relative to K, or the velocity (directed towards the negative x-axis) of a point of K with respect to K’. In short, we can designate 𝑣 as the relative velocity of the two systems. — — — — — — — — — — — — — — — — — — — — — — — —