When a time-dilated object returns to its normal speed, it experiences a re-synchronization of time with respect to the observer who is not time-dilated. Time dilation occurs when an object moves relative to another object at a significant fraction of the speed of light or in the presence of a strong gravitational field.
According to the theory of special relativity, time dilation predicts that time appears to pass more slowly for objects in motion relative to an observer who is at rest. This means that as the time-dilated object moves at high speeds, time for that object slows down relative to an observer who is stationary.
When the time-dilated object decelerates and returns to its normal speed, it undergoes a process known as "time resynchronization" or "time readjustment." This means that the object's internal clock, which was running slower due to time dilation, gradually aligns with the external clock of the observer who was not time-dilated.
From the perspective of the observer who was not time-dilated, it would appear as if the time-dilated object experienced time at a slower rate during its period of motion, and then it gradually "catches up" to the observer's time once it slows down.
It's important to note that time dilation is a well-established phenomenon supported by experimental evidence. It has been observed in various experiments, such as with atomic clocks on high-speed airplanes and satellites. However, the practical implications and effects of time dilation can vary depending on the specific conditions and velocities involved.