What about Lengths??
If B is moving at velocity v relative to A, what is the length of B measured by A?
- LB (measured by A) = v tA where tA is the time for 1-2 as measured by A.
- But from B’s point of view, a point (front edge of A) moved a distance L in a time tB at speed v ? L = v tB
- But according to A, B’s clocks run slow: tB = ? tA Therefore:??LB = v tA = v tB / ? = L / ? LB = L / ?