Does Gravity have a negative energy that cancels out positive Kinetic mass energy?
Negative energy is a bit of a mis-leading term. The gravitational potential energy is defined to be zero at infinite distance from any mass, so as you draw nearer to a mass, the potential energy drops, making it negative. However, this is simply a matter of defining your zero point. Since gravity is a conservative field, as your potential energy drops (when you approach a massive body) your overall energy must be conserved, so your kinetic energy increases. This is the reason a dropping object’s speed increases as it gets closer to the mass it is dropping towards. Thus, gravitational potential energy does not cancel kinetic energy, but rather the sum of the two is conserved (unless you have other factors such as e.g. drag which is friction with e.g. an atmosphere which transfers some of the energy into heat). As for the universe starting from a singularity, that’s what the Big Bang theory is, in a nutshell, so the answer is most likely yes, it could, but we don’t have definitive proof
