If we were able to reach the speed of light (which, according to our current understanding of physics, is not possible for objects with mass), it would have profound consequences based on Einstein's theory of special relativity. Here are some effects that would occur:
Time dilation: As an object approaches the speed of light, time slows down for that object relative to a stationary observer. This means that from the perspective of an observer on Earth, time would appear to pass more slowly for a person traveling at near-light speed. However, from the perspective of the person traveling, their own perception of time would remain normal.
Length contraction: Another consequence of special relativity is length contraction. As an object moves closer to the speed of light, its length in the direction of motion appears to shorten from the perspective of a stationary observer. This effect is only noticeable at speeds approaching the speed of light.
Regarding the G-forces and the effects on the human body:
Massive energy requirement: As an object with mass approaches the speed of light, the energy required to accelerate it further increases significantly. According to the theory of relativity, as an object with mass approaches the speed of light, its relativistic mass increases. The energy required to accelerate an object with mass becomes infinite as it approaches the speed of light, making it impossible to achieve.
Infinite relativistic mass: If it were somehow possible to exceed the speed of light, it would require an infinite amount of energy, as the mass of the object would become infinite. This would violate the fundamental principles of our current understanding of physics.
It's important to note that these effects and consequences are based on our current understanding of special relativity. The concept of objects with mass exceeding the speed of light is purely speculative and not supported by our current scientific understanding.