A particle of mass 10^−3 kg and charge 1.0 c is initially at rest At time t = 0 the particle comes under the influence of an electric field Eˆ(t) = E0 sin ω tiˆ where E0 = 1.0 N/C and ω = 10^3 rad/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 ______________