If Superman possessed the ability to run at the speed of light and had infinite energy, he would indeed have a tremendous range of capabilities and would be able to perform extraordinary feats. Running at the speed of light would give him incredible speed and the ability to traverse vast distances in a fraction of a second. Here are some of the things Superman could potentially do:
Super Speed: Running at the speed of light, Superman would have immense speed. He could move between locations with extraordinary swiftness, making him virtually impossible to catch or track.
Time Travel: The ability to move at the speed of light allows for the potential of time travel, according to some theoretical frameworks. Superman might be able to manipulate his speed and the effects of time dilation to travel forward or backward in time.
Infinite Strength: With infinite energy, Superman would possess unlimited physical strength, making him virtually unstoppable. He could easily move or lift any object, withstand powerful forces, and engage in battles against incredibly strong opponents.
Enhanced Perception: Moving at the speed of light would grant Superman heightened senses and perception. He would be able to observe and process information at an extraordinary rate, allowing him to react quickly to his surroundings and perceive things that would be imperceptible to normal human senses.
Energy Projection: Superman's infinite energy could potentially be harnessed for various purposes. He might be able to emit powerful energy beams, create force fields, or generate intense heat or light.
Interstellar Travel: With the ability to travel at the speed of light, Superman could explore the vastness of space. He would be able to visit distant star systems, travel between galaxies, and potentially encounter other civilizations.
It's important to note that the abilities of fictional characters like Superman are often subject to interpretation and the imagination of the writers. The specific capabilities and limitations of Superman's powers can vary depending on the version and continuity of the character. However, with the abilities you described, Superman would possess an extraordinary range of powers and be virtually invincible.