A flat surface of dimensions 2 m by 2 m that is given a totalcharge of 400 μC uniformly distributed over the surface, and wherea point charge +4 μC is fixed a distance 2 cm above the centre ofthe charged surface. A second point charge +16 nC, with mass 10 g,is placed at rest directly above the first point charge, at adistance 2 cm from the first point charge. The second point chargeis released and accelerates directly away from the first pointcharge and charged surface. After some time, the second pointcharge is a distance 3.4 cm from the first point charge. What isthe speed of the second point charge at this time?
