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|Δr| = √(-8)² + (6)²
|Δr| = √64 + 36
|Δr| = √100 = 10 m
vibar = Δr/ΔrΔt = r₂ - r₁/t₂ - t₁
= -8i+6j/2 = -4i+3j
|vibar| = √(-4)² + (3)²
|vibar| = √16+9
|vibar| = √25 = 5m/s