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dane h=5m, g=10m/s2, J=0,5m*r2
szukane v
Ep = Ek postępowego + Ek obrotowego
mgh = 0,5mv2 + 0,5Jw2 = 0,5mv2 + 0,5*0,5mr2w2 ale w2*r2 = v2
gh = 0,5v2 + 0,25v2 = 0,75v2
v2 = gh/0,75 = 10m/s2*5m/0,75 = 66,67m2/s2
v = 8,2m/s
...............pozdrawiam