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v^2(t)=1/2 v_0 ^2, czyli
v(t)=sqrt(2)/2 v_0,
Drganie wahadla jest harmoniczne, w zwiazku z tym:
v(t)=v_0sin(2pi t/T),
stad: sin(2pi t/T)=sqrt(2)/2
2pi t/T =pi/4
t=T/8
tadam