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v = 20m/s × 100 = 2.000cm/s
PG = 20cm
Dit : f= ??; T = ??
Jawab :
f = v÷PG
f = 2000cm/s÷20cm
f = 100 Hz
T = PG÷v
T = 20cm÷2000cm/s
T = 0,01s