Three infinite planes of charge, A, B and C, are vertical and parallel to one another. There is a uniform electric field EI, to the left of plane A and a uniform electric field EII, to the right of plane C. The field EI, points to the left and the field EII, points to the right. The signs of the charges on plates A, B and C may :

A55-kg pilot flies a jet trainer in a half vertical loop of 1200-m radius so that the speed of the trainer decreases at a constant rate. knowing that the plane has a speed of 550 km/h at point a, and the pilot experiences weightlessness at point c (i.e., the normal force from the seat bottom is zero), determine (a) the deceleration of the plane, (b) the force exerted on her by the seat of the trainer when the trainer is at point b.