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• ∆t = ta - 0 = ta
• ∆x = xa - 2 xa = - xa
• v = ∆x / ∆t = - xa / ta
ta < t < 2 ta
• ∆t = 2 ta - ta = ta
• ∆x = xa - xa = 0
• v = ∆x / ∆t = 0 / ta = 0
2 ta < t < 3 ta
• ∆t = 3 ta - 2 ta = ta
• ∆x = 0 - xa = - xa
• v = ∆x / ∆t = - xa / ta
laju:
..ada - nol - ada
perpindahan:
..ke kiri - diam - ke kiri
jawaban [D]