Answer Happy

Can’t quite figure this out, need some help.
A charged particle q traveling on the x-axis with a non-relativistic velocity approaches the origin from the left (i.e., along the +î direction). It decelerates at a constant rate a, coming to a complete stop at the origin at t=0. Using the expressions for Erad for a non-relativistic charge derived from the LW potentials, prove that the radiative part of the electric field at the point (x = 0, y = b) at t=0 is given by qab2 Er c2 R3 qa-6 Ey 2Rc4 where R= 17 - 7"(t')]. Find an expression for R in terms of a, b, and the speed of light c only. =