Two observers K and K’ observe two events, A and B. The observers have a constant relative speed of 0.8 c. In units such that the speed of light is 1, observer K obtained the following coordinates: Event A, (x,y,z,t)=(3,3,3,3); Event B, (5,3,1,5). What is the space-time interval between these two events as measured by observer K'? Is it space-like or time-like? Can Event A have caused Event B?

Two observers K and K’ observe two events, A and B. The observers have a constant relative speed of 0.8 c. In units such that the speed of light is 1, observer K obtained the following coordinates: Event A, (x,y,z,t)=(3,3,3,3); Event B, (5,3,1,5). What is the space-time interval between these two events as measured by observer K'? Is it space-like or time-like? Can Event A have caused Event B?