You are presented with the question "what does a windmill primarily use to convert wind energy into electricty?" and the following answer choices: 
- matter vibrating
 - stored energy
 - solar power
 - batteries
 - Movement of an air mass
 - heat is produced
 - energy of moving objects
 - Something to move

Now knowing that awindmill converts wind energy into electricity primarily by using mechanical energy and mechanical energy is the energy of moving objects, choose the best answer.


 

       energy of moving objects  