Answer is:
Chemical → electrical → mechanical and sound
Explanation:
Let's take this step by step:
1- For the batteries to work, chemical reactions must occur within the battery itself. This is considered "chemical energy"
2- For the CD player to start operating, it needs electrical energy that is supplied from the batteries
3- When the CD player gains this electrical energy, it can then function correctly and play the songs producing mechanical and sound energies.
So, basically the flow goes as follows:
Chemical reactions within the batteries lead to the formation of electrical energy which operates the CD player producing mechanical and sound energy.
Hope this helps :)
