In the example done with the airplane in the video lecture, how did the time taken for the round trip with a head wind going and tail wind returning compare to the time taken for the round trip with no wind?

10. Question 10 Which world line represents an object moving to the right along the x axis and slowing down (decelerating)? 1 point    

2. Question 2 On a spacetime diagram where we want to plot the world line for a light beam, why is it not useful to use units of meters for…