According to our current understanding of physics, specifically the theory of special relativity proposed by Albert Einstein, it is not possible for an object with mass to travel faster than the speed of light in a vacuum. As an object with mass approaches the speed of light, its energy requirements increase infinitely, making it impossible to exceed or reach that velocity.
Now, concerning the concept of time travel and moving backward in time, it is important to note that even if an object could travel faster than light, it would not automatically imply traveling backward in time.
Special relativity introduces the notion of time dilation, which states that time can appear to move differently for objects moving relative to each other at significant speeds. As an object approaches the speed of light, time dilation becomes more pronounced, and from the perspective of the moving object, time appears to slow down. This means that if an object were to somehow achieve or exceed the speed of light, it would experience time dilation, where time would appear to slow down for the object itself. However, this does not translate to actual backward time travel.
The notion of backward time travel, where cause and effect relationships are reversed, is not supported by our current understanding of physics. It leads to logical paradoxes and violations of causality, such as the famous "grandfather paradox." The prevailing view in physics is that the laws of causality prevent such inconsistencies from occurring, even if objects could travel faster than light.
It's worth noting that there are speculative theories and hypothetical constructs, such as wormholes and concepts related to general relativity, where the notion of time travel is explored. However, these ideas are highly theoretical and speculative, and there is currently no experimental evidence or consensus supporting the practical realization of backward time travel.
In summary, traveling faster than the speed of light, if it were possible, would not automatically result in moving backward in time according to our current understanding of physics. The theory of special relativity does allow for time dilation effects, but the concept of backward time travel remains speculative and does not align with our current knowledge of causality and the laws of physics.