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completely disappears from the final equation. This proves that the electric field inside the cavity is in both magnitude and direction.

Spring potential → kinetic: (1/2)k x^2 = (1/2) m v^2 ⇒ v = x sqrt(k/m). v = 0.10·sqrt(200 / 0.5) = 0.10·sqrt(400) = 0.10·20 = 2.0 m/s. physics galaxy discussion questions solutions

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