Which two variables determine the power generated in a strike?

The correct choice emphasizes the concepts of mass and velocity, which are key factors in determining the power generated in a strike. Power, in the context of striking, can be understood through the physics principle that relates force, mass, and acceleration, where power is the rate at which work is done.

When considering a strike, the amount of mass delivered refers to the weight behind the strike, while velocity pertains to how fast that strike is executed. A greater mass combined with a higher velocity results in a more forceful impact, thereby increasing the power generated in that strike. This relationship aligns with the basic physics formula for kinetic energy, which is dependent on both the mass and the square of the velocity of the moving object.

Other options present factors that may influence a strike, but they do not directly correlate to the fundamental physics that govern the power of a strike as effectively as mass and velocity do. For example, while the angle of strike and duration of contact can affect the effectiveness of a strike, they do not inherently determine the power generated as fundamentally as mass and velocity which directly relate to the energy transferred during the impact.