A particle with a positive charge of 91 - 2.10C moves in electrostatic field. At point Me, the potential f.8.10V the electric potential energy W of the particle is equal to its kinetic energy E a) Calculate the numerical value of the potential energy W b) Calculate the electric potential energy W, and the kinetic energy E., of the particle when it passes through a point with potential f.4.10 V Hint: Use the law of conservation of energy.​