Refine docstring and examples for kinetic_energy function

Updated the docstring to improve clarity and added a formula for kinetic energy. Adjusted parameter descriptions and examples for better understanding.

Author: twilight-debugger

physics/kinetic_energy.py

@@ -1,47 +1,56 @@
 """
-Find the kinetic energy of an object, given its mass and velocity.
-
-Description : In physics, the kinetic energy of an object is the energy that it
-possesses due to its motion.It is defined as the work needed to accelerate a body of a
-given mass from rest to its stated velocity.Having gained this energy during its
-acceleration, the body maintains this kinetic energy unless its speed changes.The same
-amount of work is done by the body when decelerating from its current speed to a state
-of rest.Formally, a kinetic energy is any term in a system's Lagrangian which includes
-a derivative with respect to time.
-
-In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling
-at a speed v is ½mv².In relativistic mechanics, this is a good approximation only when
-v is much less than the speed of light.The standard unit of kinetic energy is the
-joule, while the English unit of kinetic energy is the foot-pound.
-
-Reference : https://en.m.wikipedia.org/wiki/Kinetic_energy
+Compute the kinetic energy of an object given its mass and velocity.
+
+Formula (classical mechanics):
+    KE = ½ · m · v²
+
+Reference:
+https://en.wikipedia.org/wiki/Kinetic_energy
 """
 
 
 def kinetic_energy(mass: float, velocity: float) -> float:
     """
-    Calculate kinetic energy.
-
-    The kinetic energy of a non-rotating object of mass m traveling at a speed v is ½mv²
-
-    >>> kinetic_energy(10,10)
+    Calculate the kinetic energy of a non-rotating object.
+
+    Parameters
+    ----------
+    mass : float
+        Mass of the object (must be non-negative)
+    velocity : float
+        Velocity of the object
+
+    Returns
+    -------
+    float
+        Kinetic energy in joules
+
+    Raises
+    ------
+    ValueError
+        If mass is negative
+
+    Examples
+    --------
+    >>> kinetic_energy(10, 10)
     500.0
-    >>> kinetic_energy(0,10)
+    >>> kinetic_energy(0, 10)
     0.0
-    >>> kinetic_energy(10,0)
+    >>> kinetic_energy(10, 0)
     0.0
-    >>> kinetic_energy(20,-20)
+    >>> kinetic_energy(20, -20)
     4000.0
-    >>> kinetic_energy(0,0)
+    >>> kinetic_energy(0, 0)
     0.0
-    >>> kinetic_energy(2,2)
+    >>> kinetic_energy(2, 2)
     4.0
-    >>> kinetic_energy(100,100)
+    >>> kinetic_energy(100, 100)
     500000.0
     """
     if mass < 0:
-        raise ValueError("The mass of a body cannot be negative")
-    return 0.5 * mass * abs(velocity) * abs(velocity)
+        raise ValueError("Mass must be non-negative")
+
+    return 0.5 * mass * velocity ** 2
 
 
 if __name__ == "__main__":