Energy in motion.

• A. Potential Energy
• B. Thermal Energy
• C. Electrical Energy
• D. Kinetic Energy

Answer: (D)

The main idea here is energy tied to motion. That is kinetic energy—the energy an object has because it is moving. It depends on how heavy the object is and how fast it’s going, described by KE = 1/2 m v^2. So, the faster or heavier something is, the more kinetic energy it has. For example, a rolling ball or a car in motion carries kinetic energy that changes as speed changes.

The other terms describe different kinds of energy: potential energy is stored energy due to position (like a rock held up on a hill), thermal energy comes from the random motion of many particles and relates to temperature, and electrical energy comes from electric charges or currents. Since the focus is on energy that results from motion, kinetic energy is the best fit.