* Calculations: 120 V is single-phase; other classes are three-phase.
We model the punch as a mass of fist and arm acceleration. Using:
m = 100 kg // approximate mass contributing to punch
v = 4.5 m/s // estimated punch speed
Compute kinetic energy:
E = ½ m v²
= ½ × 100 kg × (4.5 m/s)²
= 50 × 20.25
= 1,012.5 J
Therefore, each punch delivers around ≈1,010 J (≈1.01 kJ) of energy.