825.2 the need for change and the postulates of the special theory @troubles with our ideas about length Suppose an observer in the above laboratory placed one marker at location of pions formation and another at the location of its decay. The distance between the two markers is measured to be 17.4 m Another observer who is traveling along with ion at a speed of u=0.913c. To this observer. the distance between the two markers showing the formation and decay of the pion is(0.913c)(26,0×1039)=7.1m. Two observers who are in relative motion measure different values for the same length interval 825.2 the need for change and the postulates of the special theory @troubles with our ideas about speed Light signal showi A throwing ball If the observer a throws a ball at superluminal speed. the result observed by Light signal showing A th observer O will Light signal showi B catching ball be that the g the ball before the observer a throwing it 88 2troubles with our ideas about length Suppose an observer in the above laboratory placed one marker at location of pion’s formation and another at the location of its decay. The distance between the two markers is measured to be 17.4 m. Another observer who is traveling along with pion at a speed of u=0.913c . To this observer, the distance between the two markers showing the formation and decay of the pion is (0.913c)(26.0×10-9s)=7.1 m. Two observers who are in relative motion measure different values for the same length interval. §25.2 the need for change and the postulates of the special theory 3troubles with our ideas about speed If the observer A throws a ball at superluminal, speed, the result observed by observer O will be that the observer B get the ball before the observer A throwing it. §25.2 the need for change and the postulates of the special theory