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Verified answer
Gelombang.Kelas XI kurikulum 2013 revisi 2016.
y = A sin (ωt - kx)
y = 10 sin [π(0,5t - 2x)] = 10 sin (0,5πt - 2πx)
v = ω / k
= (0,5π rad/s) / (2π m⁻¹)
= 0,25 m/s