Yes, that would be calc stacking. It is similar to this example but in reverse:
Character A was calculated to be able to punch with an energy of 50 000 Joules. Assuming his fist weights about 0.5 kg, it needed to move at least with Mach 1.3 to get that much energy. So the attack speed of that character and the speed of everyone who can dodge his punches is supersonic.