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m = 1000 kg
v₁ = 0 m/s
v₂ = 72 km/jam → 20 m/s
ditanya :
w = ...?
jawab :
w = ΔEk
w = 1/2 m (v₂² - v₁²)
w = 1/2 1000 (20² - 0²)
w = 500 (400)
w = 200000 J → 2 . 10⁵ J