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menentukan kecepatan rata-rata benda
DIKETAHUI
persamaan posisi
r = ((60t + 2t²) i + (10t - 4t²) j) m
saat t₁ = 0 s
r₁ = 0i + 0j
saat t₂ = 10 s
r₂ = 400i + (-300)j
besar perpindahan dari t₁ = 0 s hingga t₂ = 10 s
∆r = r₂ - r₁
= (400i + (-300)j) - (0i + 0j)
= 400i - 300j
kecepatan rata-rata pesawat adalah
v = ∆r/∆t
= (400i - 300j)/(10-1)
= 40i - 30j
Sedangkan besar kecepatan rata-rata
|v| = √(40² + (-30)²) = 50 m/s ✔️
Semoga jelas dan membantu