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20π = 2π / T
T = 2π / 20π = 0,1 s
f = 1 / T = 1 / 0,1 = 10 Hz
persamaan kecepatan getar
120 π cos 20πt --> ωA cos ωt
persamaan percepatan getar
-2400 π^2 sin 20πt ---> -ω^2 A sin ωt