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X = 8t
Y = 4t² - 2
Persamaan vektor posisi
r(t) = X i + Y j
r(t) = 8t i + (4t² - 2) j ← jawaban
Posisi benda saat t = 1 s
r(1) = 8t i + (4t² - 2) j = 8i + 2j
Posisi benda saat t = 2 s
r(2) = 8t i + (4t² - 2) j = 16i + 14j
Perpindahan benda dari t = 1 s hingga t = 2 s
S = Δr
= r(2) - r(1)
= 16i + 14j - (8i + 2j)
= 8i + 12j ← jawaban
Besar perpindahan
|S| = √(Sx² + Sy²)
= √(8² + 12²)
= √(4²·2² + 4²·3²)
= √(4²· (2² + 3²))
= √(4²· 13)
= 4√13 m ← jawaban