Main Question or Discussion Point
According to special relativity, KE= ([PLAIN]https://upload.wikimedia.org/math/3/3/4/334de1ea38b615839e4ee6b65ee1b103.png-1)(mv^2)/2. [Broken] Since the velocity measured is dependent on a person's frame of reference, then does that mean energy too is dependent on frame of reference? For example, if an observer in Car A is moving at velocity, V, and a person in Car B is moving at velocity, V, also, then according to the observer in Car A, the person in Car B would have 0 J of kinetic energy?
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