August 2018 1 128 Report
Jika gerakan penggaris b-c-b-a membutuhkan waktu 1/4 sekon maka periode getaran penggaris a dalah
a.1/8 skeon
b.1/3 sekon
c.1/2 sekon
d.3/4 sekon

jangan lupa dg cara dan penjelasan ya.
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