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v1 = 10 m/s
v2 = 20 m/s
W = ΔEk
W = 1/2 . m . (v2² - v1²)
W = 1/2 . 10 . (20² - 10²)
W = 5 . (400 - 100)
W = 5 . 300
W = 1500 J