Cancer viruses transform cells by integrating themselves into what part of the host cell?

Cancer is not a virus. 
Viruses replicate using the host cell RNA. 
With some viruses this may lead to an increased risk of certain cancers.

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.