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y= 0,2 sin 8πt - 2πx
maka: A= 0,2
W= 8π
k= 2π
ditanya: v........?
jawab: f= W/2π = 8π/ 2π = 4 Hz
lamda= 2π/k = 2π/ 2π = 1 m
v= lamda x f
v= 1 x 4 = 4 m/s