The answer is d because you are using energy to pull the sled back up, which is mechanical energy
Yes because mercury has more protons and electrons that tin. (30 more)
I think metal, steel and copper.
1. electrons
2. positive to negative
3. insulator
4. TRUE
5. closed circuit
6. TRUE
7. series
8. TRUE
9. v=ir
10. TRUE
Hope this helps! :)
