There is twin, Ethan (E) and Stanley (S), if E stays on Earth while, S travels in Spaceship with a speed of v, makes a "U" turn at a distance 10 light years from earth to complete the trip and back to earth as shown in the Fig. 1 below. When Stanley meets Ethan on earth, the age difference between them is found to be 10 years. Determine the speed of spaceship, v, in the fraction of c.
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