1. The problem statement, all variables and given/known data At what speed does a clock have to move in order to run at a rate which is one half that of a clock at rest? 2. Relevant equations [tex]\Delta T = \gamma \Delta T_0[/tex] 3. The attempt at a solution For clocks to run at half it's spd, [tex]\Delta T = 2 \Delta T_0[/tex] [tex]\gamma = 2[/tex] which works out to v = 0.866c Is this correct? Qns 2 : i saw in the physic formulary list this : Clock desynchronization: Moving clocks, synchronized in their rest frame but separated by a distance D along their direction of motion, are not synchronized in the stationary frame; The front clock lags the rear clock by an amount: [tex]T = Dv/c^2[/tex] What does it mean? If 2 clocks are moving at the same spd, shouldn't they run in the same time as well and should be synchronized? Any help will be appreciated.