Since time is relative to the observer's velocity, does that mean that velocities are also relative, since the same distance is covered in a different time, depending on your reference frame? If velocities are relative, does that mean that kinetic energy is also relative via $E_{kinetic} = \frac{1}{2} mv^2$? And if kinetic energy is relative, does that mean that mass is relative, via $E = mc^2$ ?
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