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1/ϒ = √1 - v²/c²
1/ϒ = √1 - 0,8²/c²
1/ϒ = √1 - 0,64
1/ϒ = √0,36
1/ϒ = 0,6
Lt = Lo x 1/ϒ
Lt = 100 x 0,6
Lt = 60 meter
Jadi, menurut orang di Bumi, panjang roket tersebut adalah 60 meter
Ok?