Frank and Mary are twins, and Mary wants to travel toour nearest star system, Alpha

Chapter 2, Problem 97

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Frank and Mary are twins, and Mary wants to travel toour nearest star system, Alpha Centauri (4.30 lightyearsaway). Mary leaves on her 30th birthday and intends toreturn to Earth on her 52nd birthday. (a) Assumingher spaceship returns from Alpha Centauri withoutstopping, how fast must her spaceship travel? (b) Howold will Frank be when she returns?

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