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I'll make this simple as this actually bothered me for over a year now. The upper limit for Human level seems quite low; a measly 100 joules.
An average person can easily break past this limit. especially with kicks. This is because legs have a lot more mass than an arm, and a kick is also faster than a punch, which would greatly increase the kinetic energy in compared to a punch.
Lets say an average person weighs 65kg.
This shows how much mass body segments weigh.
Since a kick uses the entire leg, I will use the total leg mass.
Average male leg mass: 10.855kg
Average female leg mass: 11.96kg
As for the speed, I will use a low, mid, and high end; 5 m/s, 7.7 m/s, and 19.2 m/s
(Reason for 19.2 m/s is that it's the speed of a roundhouse kick, according to Page 14 of this thesis from Iowa State University)
Male
Low End: 10.855kg / 2 * 5 m/s^2 = ~136.063 joules (Athlete level)
Mid End: 10.855kg / 2 * 7.7 m/s^2 = ~322.686 joules (Street level)
High End: 10.855kg / 2 * 19.2 m/s^2 = 2,006.323 joules (Street level)
Female
Low End: 11.96kg / 2 * 5 m/s^2 = ~149.5 joules (Athlete level)
Mid End: 11.96kg / 2 * 7.7 m/s^2 = ~354.554 joules (Street level)
High End: 11.96kg / 2 * 19.2 m/s^2 = ~2,204.467 joules (Street level)
(I also want to say that 5 m/s is very slow for a kick)
An average person can easily break past this limit. especially with kicks. This is because legs have a lot more mass than an arm, and a kick is also faster than a punch, which would greatly increase the kinetic energy in compared to a punch.
Lets say an average person weighs 65kg.
This shows how much mass body segments weigh.
Since a kick uses the entire leg, I will use the total leg mass.
Average male leg mass: 10.855kg
Average female leg mass: 11.96kg
As for the speed, I will use a low, mid, and high end; 5 m/s, 7.7 m/s, and 19.2 m/s
(Reason for 19.2 m/s is that it's the speed of a roundhouse kick, according to Page 14 of this thesis from Iowa State University)
Male
Low End: 10.855kg / 2 * 5 m/s^2 = ~136.063 joules (Athlete level)
Mid End: 10.855kg / 2 * 7.7 m/s^2 = ~322.686 joules (Street level)
High End: 10.855kg / 2 * 19.2 m/s^2 = 2,006.323 joules (Street level)
Female
Low End: 11.96kg / 2 * 5 m/s^2 = ~149.5 joules (Athlete level)
Mid End: 11.96kg / 2 * 7.7 m/s^2 = ~354.554 joules (Street level)
High End: 11.96kg / 2 * 19.2 m/s^2 = ~2,204.467 joules (Street level)
(I also want to say that 5 m/s is very slow for a kick)