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L' = panjang benda saat dipanaskan
L = panjang awal benda
k = koefisien muai panjang
T = perubahan suhu benda
Rumus: L' - L = L k T
jadi, 1,9 - 10 = 10 k (32 - 22)
0,9 = 10 k 10
0,9 = 100 k
k = 0,009 jadi jawabannya A, semoga membantu..