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Seorang astronot memiliki saudara kembar dan pergi ke ruang angkasa pada umur 40 tahun. Astronot tersebut kembali ke bumi dan saudara kembarnya kini berusia 50 tahun. Menurut astronot, umur saudara kembarnya seharusnya 48 tahun. Berdasarkan cerita tersebut, maka kecepatan pesawat luar angkasa yang digunakan astronot untuk pergi sebesar . . .
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Seorang astronot memiliki saudara kembar dan pergi ke ruang angkasa pada umur 40 tahun. Astronot ter...
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