7. In the gedanken experiment shown in ▶ Figure 26.16, two events in the same inertial reference frame O are related by cause and effect: (1) A gun at the origin fires a bullet along the x-axis at a speed of 300 m/s. (Assume no gravitational or frictional forces.) (2) The bullet hits a target at x = +300 m. Show, using qualitative arguments, that the two events cannot be viewed simultaneously by any inertial observer. (Note: This question shows that special relativity preserves the time sequence of two events if they are related as cause and effect. In this situation, this means that all observers agree that the gun fires before the bullet hits the target.)