Brian is riding his skateboard to his friend's house. Brian is pushing on the ground with his foot to move himself and the skateboard forward. Which energy is transformed into mechanical energy?

A. Radiant energy

B. Chemical energy

C. Sound energy

D. Electrical energy

According to the Law of Conservation of Energy, energy is neither created nor destroyed. It is an entity that's always existing in the environment. It takes different forms of energy. Among the choices, the best answer would be letter B. Chemical energy. The chemical energy originates from the energy within the muscles that are dormant. Once used, this chemical energy is transformed into mechanical energy by the action of pushing his foot on the ground.