EKr = ½ i w²= ½ m.r² . (V/r)²= ½ 0,5.0,5² . (20/0,5)²= 0,25.0,25 .40²= 100
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EKr = ½ i w²
= ½ m.r² . (V/r)²
= ½ 0,5.0,5² . (20/0,5)²
= 0,25.0,25 .40²
= 100