Solving a problem in physics section 71 point 45 electr

45. An electron flies into a plane horizontally located capacitor with a speed υ0 = 9 ∙ 107 m / s, directed parallel to the plates. The distance between the plates of the capacitor is d, the potential difference is U = 120 V, the length of the plates is l = 18 cm. If the vertical displacement of the electron at the outlet of the capacitor is h = 0.1 cm, then what is the distance d between the plates?