Question 3: Consider two time-like events P and Q. P is at the space-time origin P=(0,0); Q is at the space origin but one second later Q=(0,1). Show that the order of events is preserved by all observers travelling at less than the speed of light. Now events P and Q are space-like. P is still at the origin, but Q is simultaneous with P but one meter to the right 0=(1.0) .Show that the order of events is not preserved by observers travelling at less than the speed of light.