There are MANY of them, but I shall name the three that I find dangerous.
1- We would run out of energy, which could happen eventually if we do not use this resource wisely.
2- We could get a-lot of diseases/illnesses because WE ourselves are made of electricity, and if we take up too much, we could get sick.
3- We would rely on electricity too much, and later if it runs out, we would die....literally. <span />
We can solve the problem by using the law of conservation of energy:
- at the beginning, all mechanical energy of the object is just kinetic energy:
, where m is the mass and v is the velocity
- at the point of maximum height, all mechanical energy of the object is just gravitational potential energy:
, where h is the maximum height
Therefore, the conservation of energy becomes:

Re-arranging, we find the maximum height:

Particles can either have a positive or negative charge.