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A woman leaves the earth in a spacecraft
that makes a round trip to a star, 6 light-
years distant, at a speed of 0.8c. How much
younger is she upon her return than her
twin sister who remained behind?
А. 7.5.0 у
В. 6.0y
C. 4.5y
D. 3.0y
Е. 1.5y

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