To an Earth observer, metersticks on three spaceships are seen to have these lengths. Rank the speeds of the spaceships relative to Earth from highest to lowest.

Answer: From the reference to the figure in the question , Highest velocity is of figure (C) , then (B), and (A) , According to the formula of Relativistic , length contraction l= l 1 V /c 2 0 l= Contracted length l = Length at rest. 0 V= velocity of the of meterstick C= speed of light