3. A parallel-plate capacitor is formed of two 10 cm x 10 cm plates are charged to ±1.0 nC. An electron is shot through a very small hole in the positive plate. What is the slowest speed the electron can have as it passes through the hole if it is to reach the negative plate? Find (a) using forces and electric field and (b) using energy conservation. +1.0 nC -1.0 nC + + +

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!