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5 cm = 13 cm sin ωt
Sin ωt = 5 / 13
Jika sin ωt= 5/13 maka cos ωt = 12/13
Sehingga
v = Aω cos ωt
= A.(2πf) cos ωt
= 13 (2π.10). 12/13
= 240 π cm/s