A charged particle begins to move from the origin in a region which has a uniform magnetic field in the x-direction and a uniform electric field in the y-direction. Its speed is v when it reaches the point (x, y, z). Then, v will  NOT depend

For a particle moving in any combination of electric and magnetic fields, work is done only by the electric field. Energy of the particle = work done by the electric field =Force due to  electric field x displacement in the direction of the electric field.