October 2018 2 121 Report
Menurut pengamat di bumi, panjang pesawat ruang angkasa tinggal 3/4 dari panjang semula. Laju pesawat tersebut adalah...(dengan c adalah laju cahaya dalam vakum)
(A) 1/4 akar(7) c
(B) 2/3 c
(C) 1/5 akar(7) c
(D) 1/2 c
(E) 1/6 akar(7) c
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