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How do you derive the escape velocity formula?

Find the final velocity of a cathode ray on a superconductive mag lev train traveling a .99c that was launched off ground level tracks at 30 degrees. And how many people where killed in the train crash.

Are blue supergiants ever on the main sequence? And whats before a blue supergiant

If I interpreted it right the interactive book one wasn't that hard if you used a multidimensional array. All you had to do was display page[1][1] and then have a for loop where you get the next choice and display the next page.