A particle, of mass 10−3kg and charge 1.0C, is initially at rest. At time  t=0, the particle comes under the influence of an electric field  Et=E0sinωt i⌢, where E0=1.0N/C  and  ω=103rad/s. Consider the effect of only the electrical force on the particle. Then the maximum speed, in m/s , attained by the particle at subsequent times is   .