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t = 20 sekon
n = 15
Dit : f dan T
Jawab :
f = n/t
f = 15/20
f = 0,75 Hz
T = 1/f
T = 1/0,75
T = 1,33 sekon atau 1,34 sekon
atau
T = t/n
T = 20/15
T = 1,33 sekon atau 1,34 sekon