A partical having charge that of an electron and mass `1.6xx10^(-30)`kg is projected with an initial speed u at the angle `45^(@)` to the horizontal from the lower plate of a parallel-plate capacitor as shown in fig. The plates are suffiecienly long and have a separation of 2 cm, find the maximum value of the velocity of he particle so that it does not hit the upper plate. Take the electric field between the plates as `10^(3)Vm^(-1)` directed upward.