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t=3s
V=8m/s
Obl f
opoznienie
a=V/t
z 2-giej zas dyn
T=ma ale T=mg*f
f*mg=ma
f=a/g=V/(t*g)=8/(3*9,81)=0,27
Odp. Sredni wspolczynik tarcia kamienia o podloze =0,27