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t2 = 78c
L0 = 80 m
α = 0,00002/celcius
tanya = Lt
jawab = Lt = L0 (1+α x Δt)
= 80 (1+ 0,00002 x 50 )
= 80 x 1,001
= 80,08
pertambahan panjangnya adalah 0,08 m