An electron passing through the field of a stationary plane capacitor receives a transverse momentum p. The electron velocity at the input of the capacitor is equal to βc and is directed parallel to its plates. What transverse momentum will the electron receive if, on the contrary, the capacitor flies past the initially stationary electron at a speed of −βc? How many times will the transverse velocity acquired by the electron the first time be less than the transverse velocity obtained by the electron the second time?