Two positively charged balls are brought together in a region of the universe where we can assume that nothing acts on them aside from one another. When they are released from rest, the balls accelerate away from one another. In case 1, what can you say about the balls?

1. They have the same mass.
2. They have the same charge.
3. Both of the above.
4. Neither of the above has to be true.

In case 2 the two balls have different masses. After the balls are released from rest, which ball has more kinetic energy?

1. The lighter one.
2. The heavier one.
3. They have equal kinetic energies.