v=ωr=2ϵθr=2⋅2⋅4π⋅0.4=2.84 ms.v=\omega r=\sqrt{2 \epsilon \theta}r=\sqrt{2 \cdot 2 \cdot 4 \pi}\cdot 0.4=2.84 ~ \frac ms.v=ωr=2ϵθr=2⋅2⋅4π⋅0.4=2.84 sm.
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