Final answer:
The kinetic energy of a horse running at a constant speed can be calculated using the formula KE = 0.5 * mass * velocity^2.
Step-by-step explanation:
The kinetic energy of an object is given by the formula:
Kinetic Energy (KE) = 0.5 * mass * velocity^2
Given that the mass of the horse is 100 kg and it is running at a constant speed, we need to determine the velocity of the horse. However, the question does not provide information about the velocity of the horse. Please provide the velocity so that we can calculate the kinetic energy accurately.