A tiny hole is made in the center of the negatively and positively charged plates of a capacitor, allowing a beam of electrons to pass through and emerge from the far side. If 3.9 V are applied across the capacitor plates and the electrons enter through the hole in the negatively charged plate with a speed of 2.90* 10^6 m/s, what is the speed of the electrons as they emerge from the hole in the positive plate?