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x = (t² - 10t) i + 6tj
xt₁ =(t² - 10t) i + 6tj
= ((1)² - 10(1)) i + 6(1)j
= -9i + 6j
xt₂ = ((2)² - 10(2)) i + 6(2)j
= -16i + 12j
jadi untuk selang waktunya dikurangi aja ..
Δxt = xt₂ - xt₁
Δxt = (-16i + 12j) - (-9i + 6j)
Δxt = -7i + 6j