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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.
Ethan
Distance at this point
10 light years
Stanley
Figure 1

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