Gave meaningful names to function parameters

Author: kvadrik

physics/relativistic_velocity_summation.py

@@ -5,15 +5,17 @@
 of an object moving at speed v1 relative to a frame that is itself moving at velocity v
 relative to an observer. I take the last one to be strictly lower than the speed of
 light.
-The formula is v2 = (v1 + v)/(1 + v1 * v / c^2)
+The formula is v2 = (v1 + v)/(1 + v1 * v / c**2)
 v1 - speed of the object relative to a moving frame
 v - speed of the moving frame
 c - speed of light in the vacuum
 v2 - speed of the object relative to an observer
 """
 
 
-def relativistic_velocity_summation(v1: float, v: float) -> float:
+def relativistic_velocity_summation(
+    object_velocity: float, frame_velocity: float
+) -> float:
     """
     >>> relativistic_velocity_summation(200000000, 200000000)
     276805111.0636436
@@ -24,12 +26,15 @@ def relativistic_velocity_summation(v1: float, v: float) -> float:
         ...
     ValueError: Speeds must not exceed light speed...
     """
-    if v1 > c or v >= c or v1 < -c or v <= -c:
+    if (object_velocity > c or frame_velocity >= c or 
+        object_velocity < -c or frame_velocity <= -c):
         raise ValueError(
             "Speeds must not exceed light speed, and "
             "the frame speed must be lower than the light speed!"
         )
-    return (v1 + v) / (1 + v1 * v / (c * c))
+    numerator = object_velocity + frame_velocity
+    denominator = 1 + object_velocity * frame_velocity / c**2
+    return numerator / denominator
 
 
 if __name__ == "__main__":