Two events are observed by inertial observer Stampy to occur aspatial distance of 15 c·s apart with the spatial coordinate of thesecond larger than the spatial coordinate of the first. Stampy alsodetermines that the second event occurred 17 s after the first.According to inertial observer Philip moving along Stampy’s +x axisat unknown velocity v, the second event occurs 10 s after thefirst. (1 c·s = 1 light-second = unit of distance.)

a) Given Philip measures the spatial coordinate of the secondevent to be larger than the first, determine v.

b) How far apart spatially (in c·s) do the two events occuraccording to Philip?

c) Does there exist an inertial reference frame v < c inwhich the second event can occur before the first? Briefly explainin one sentence at most.
d) Inertial observer Kenny observes the proper time between the twoevents. How fast along Stampy’s +x axis does Kenny move?

(Note: Each part of this question can be done independently ofany other. In part a, depending on how you solve it, you mightobtain two answers as solutions of a quadratic, but one of them isextraneous, because it violates the premise in part a. If you arecareful, you can avoid the quadratic at the outset, but it requiresyou to solve part b first.)