On their 20th birthday, sheldon got annoyed with his twin sister missy and decided to escape to a newly discovered planet q, which is 6 lightyears away from earth. he boarded his spaceship and zipped to planet q with a speed of 0.600c. upon reaching 5. planet q, sheldon regretted his pettiness and zipped right back to earth with a speed of 0.800c. (a) what is sheldon's biological age upon his return to earth? (b) what is missy's age upon sheldon's return to earth? (1 lightyear 9.46 x 105 m
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