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g=Δv /t → t = Δv/g
Łączymy te dwa rownania podstawiajac do pierwszego t:
H=Δv²/2g → Δv=√2gH
Δv=vk - v₀, przy spadku swobodnym v₀= 0
wiec Δv=vk
vk=√2gH=√2*10m/s²*5m=10m/s