1. The problem statement, all variables and given/known data A small ball has mass 3.4x10^-8 kg and charge of 2.0x10^-5 C. It enters a box with initial speed 1.2x10^4 m/s. The point where the charge leaves the box is at a voltage 350kV higher than the entry point. Find the speed of the ball as it leaves the box. 2. Relevant equations ΔE = E - E0 ΔE = q(V) E = 1/2mv2 3. The attempt at a solution E = 1/2 (3.4x10-8)(1.2x104)2 = 2.448 J ΔE = (2.0x10-5)(350000)= 7 J 7J = E - 2.448J 9.448J = 1/2(3.4x10-8)v2 v = sqrt ((2(9.448))/(3.4x10-8) v = 23577 m/s Does this look right? Apparently the ball doesn't leave the box. But that doesn't make any sense to me.