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h = 80m
g = 10m/s²
Szukane:
vk=?
Ek=Ep; mv²/2 = mgh (masy się skrócą)
v²/2 = gh
po przekształceniu:
v² = 2gh
v² = 2*10m/s²*80m = 1600m²/s²
v = √1600m²/s²
v = 40m/s