According to the principles of special relativity, it is not possible for an object with mass to travel at or exceed the speed of light in a vacuum, which is approximately 299,792,458 meters per second. This speed is often denoted as "c" in physics.
As an object with mass approaches the speed of light, its energy and momentum increase significantly. However, the increase in energy becomes infinite as the object reaches the speed of light, which is impossible to achieve. This means that it would require an infinite amount of energy to accelerate an object with mass to the speed of light.
Additionally, special relativity states that the laws of physics, including cause and effect, behave consistently for all observers regardless of their relative motion. This means that if an object were somehow able to exceed the speed of light, it would violate the principles of causality and lead to paradoxes and contradictions within the theory.
Therefore, even if you were hypothetically able to move at the speed of light, you would not be able to throw a stone ahead of you at a faster speed. The stone would still be subject to the speed limit of light and could not travel faster than that.