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v₁ = 10 m/s
v₂ = 40 m/s
ditanya : W = .... /
dijawab :
W = ΔEk
= 1/2 . m . (v₂² - v₁²)
= 1/2 . 40 . (40² - 10²)
= 20 . (1600 - 100)
= 20 . 1500
W = 30000 joule = 30 kj