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v1² = v1'² + 2 g h
20 20 = v1'² + 2 10 15
400 = v1'² + 300
v1'² = 100
v1' = 10 m/s
Ek2 = 1/2 m v1'²
Ek2 = 1/2 0,8 10 10
Ek2 = 40 Joule
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