Final answer:
The kinetic energy generated by a baseball player's legs during a pitch is significant, but without specific measurements of velocity and mass of the lower extremities, it is not possible to provide an exact amount of energy produced.
Step-by-step explanation:
The question asks about the kinetic energy generated by a baseball player's lower extremities during a pitch. To determine how much energy the lower extremities produce, we need to consider that kinetic energy is the energy of motion and is calculated using the equation KE=0.5mv2, where m is mass and v is velocity.
In baseball, a significant amount of kinetic energy comes from the power generated in the legs and hips.Rotational kinetic energy also plays a crucial role since the pitcher's arm and ball rotate about a pivot point, usually the shoulder or elbow. For a ball of mass 149 g thrown at 100 mi/h, for instance, the kinetic energy can be calculated.
However, the exact percentage of this kinetic energy provided by the lower extremities requires additional specific measurements, such as the velocity and mass of the lower extremities and the total energy transferred to the ball. Without this information, we cannot provide a precise answer.