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V2=2m/s
Początkowo ma Ek1=mV1²/2
Końcowa Ek2=mV2²/2
Więc
Ek2/Ek1=(mV2²/2)/(mV1²/2)=V2²/V1²=2²/0,5²=4/0,25=16
Ek wzrosła 16 razy