Odpowiedzi

2013-07-02T15:25:56+02:00

 

m = 2kg

v₁ = 2m/s

v₂ = 4m/s

 

Ek = 0,5mv²

W = ΔEk

 

Ek₁ = 0,5*2kg*(2m/s)² = 4J

Ek₂ = 0,5*2kg*(4m/s)² = 16J

 

ΔEk = 16J - 4J = 12J

 

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