How does special relativity affect the calculation of kinetic energy?

Special relativity affects the calculation of kinetic energy by introducing the concept of relativistic mass, which increases as an object's speed approaches the speed of light. This means that the traditional formula for kinetic energy, which only considers the object's rest mass, is no longer accurate at high speeds. Instead, the correct formula for kinetic energy in special relativity includes the object's total energy, which accounts for its relativistic mass.