Final answer:
The relativistic sum of two velocities is given by the formula w/c = (u/c + v/c)/(1+ uv/c²). This equation allows us to calculate the combined velocity when an object is moving relative to two different observers.
Step-by-step explanation:
The relativistic sum of two velocities in physics is given by the formula w/c = (u/c + v/c)/(1+ uv/c²). This equation allows us to calculate the combined velocity when an object is moving relative to two different observers. u represents the velocity of an object relative to one observer, v represents the relative velocity between the two observers, and c is the speed of light.