[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

physics/collisions.py

@@ -117,9 +117,9 @@ def type_collision(
     kinetic_final = 0.5 * ((mass1 * velocity_final1**2) + (mass2 * velocity_final2**2))
 
     if kinetic_final == kinetic_initial and momentum_initial == momentum_final:
-        return 'Perfectly Elastic Collision'
+        return "Perfectly Elastic Collision"
     elif kinetic_final != kinetic_initial and momentum_initial == momentum_final:
-        return 'Perfectly Inelastic Collision'
+        return "Perfectly Inelastic Collision"
     else:
         return "Inelastic Collision"