Use the conservation of energy to explain the speeds at different places in the diagram of the roller coaster.

Explanation:

9.

The first factor is the amount of charge on each object. The greater the charge, the greater the electric force. The second factor is the distance between the charges

10.

To charged objects will attract each other if they have opposite charges (one is positive and the other is negative).

11.

Two charged objects will: repel each other if they have like charges (they are both positive or both negative).