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Massa jenis linier
+
= massa pegas merenggang
-
= massa pegas merapat
Persamaan momentum
= ̅
̅
= …… (4.32)
̅
̅
=
= ̅
= ̅
= ̅
= ( + ) …… (4.31)
Keterangan :
= i ( −1)
= j i ( −1)
∆ = i j i ℎ
Jadi total massa dapat ditentukan terhadap
= ̅
Karena v konstan maka,
=
m total = ……….. (4.33)
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