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vk=√(2gs)
vk≈31,62m/s
g=10m/s²
Ep=Ek
mgh=mv²÷2/:m
gh=v²÷2/ ×2
2gh=v² /√
v= √2gh
v=√2x10m/s²x50m
v=√1000m²s²
v=10√10m/s
Odp.