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Ditanyakan: v (3)?
v = dr/dt (turunan)
v = 4 i + (-2t + 6) j
v (3) = 4 i + (-2 . 3 + 6) j
v (3) = 4 i + (-6 + 6) j
v (3) = 4 i + 0 j
|v| = √(i²+ j²)
|v| = √(4² + 0²)
|v| = √16
|v| = 4 m/s