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 E(t) = E₀ sin ωt î, where E₀ = 1.0 N C⁻¹ and ω = 10³ rad s⁻¹. Consider the effect of only the electrical force on the particle. Then the maximum speed, in m s⁻¹, attained by the particle at subsequent times is __________.