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2013-12-08T07:21:41+07:00
R=25cm=0,25m T=8/2=4 t=3.60=180sekon
v=2.phi.R/T
  =2.3,24.0,25 /4
  =0,3925 m/s

s=v.t
  =0,3925.180
  =70,65m=7065cm
  
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