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Vk=?
vp=20m/s
h=20m
g=10m/s²
Ek1+Ep1=Ek2+Ep2
mvp²/2+mgh=mvk²/2+0 /:m/2 ( bo h=0- na ziemi)
vk²=vp²+2gh
vk²=(20m/s)²+2*10m/s²*20m
vk²=400m²/s²+400m²/s²
vk²=800m²/s² /√
vk=√800m²/s²
vk=20√2 m/s