Question

what happens when water is released from a dam?
potential energy is converted into kinetic energy
chemical energy is converted into potential energy
mechanical energy is converted into kinetic energy
kinetic energy is converted into potential energy

Explanation:

When water is stored in a dam, it has potential energy due to its height. When released, it starts moving (has velocity), so potential energy (due to height) is converted to kinetic energy (due to motion). Chemical energy (related to chemical bonds) is not involved here. Mechanical energy is the sum of potential and kinetic energy. Kinetic to potential would be when water is lifted up (opposite of release).

Answer:

Potential energy is converted into kinetic energy