A particle, of mass ${10^{ - 3}}kg$ and charge $1.0C,$ is initially at rest. At time $t=0,$ the particle comes under the influence of an electric field $$\overrightarrow E \left( t \right) = {E_0}\sin \,\,$$ $\omega t\widehat i,$ where ${E_0} = 1.0\,N{C^{ - 1}}$ and $\omega = 10{}^3\,rad\,{s^{ - 1}}.$ 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 $\underline{\hspace{2cm}}$.