Velocity of the sled is 3.2 m/s
        
             
        
        
        
Answer:
The answer is X 
Explanation:
 Cause the highest points will most likely have the most potential energy 
 
        
             
        
        
        
2 someone's glasses could fall of because of the inertia
roller coaster is in motion but your glasses are opposing and resisting that motion due to inertia....
1 there is a possibility that electrons move from wheels to the rail and vice versa which also means that it is producing some kind of electrical energy 
3 question can't answer
        
             
        
        
        
Answer:
Manganese oxide prevents polarisation in dry cells. - Polarization is a defect that occurs in simple electric cells due to the accumulation of hydrogen gas around the positive electrode. ... - MnO2 reacts with H2 and forms water as byproduct, so depolarization doesn't occur.