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v₁ = 20 m/s
t = 5 sekon
S = 200 m
S = ¹/₂ * (v₁ + v₂) * t
200 = ¹/₂ * (20 + v₂) * 5
v₂ = 60 m/s
Usaha, W = ?
W = ¹/₂ * m * (v₂² - v₁²)
W = ¹/₂ * 100 * (60² - 20²) = 160.000 Joule = 160 kJ