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V1=15,8m/s
V2=12,2m/s
Ek1=mV1²/2
Ek2=mV2²/2
ΔEk=Ek1-Ek2
ΔEk=0,2kg*(15,8m/s)²/2-0,2kg*(12,2m/s)²/2=24,964-14,884=10,08J