A particle with a mass $2\mathrm{.}4$ x $10-5$ kg and a charge of $5\mathrm{.}4$C moves in electric field between two points A and B on a horizontal line. The electric potential at point A is higher than that at B by $60$V$.$ If the particle leaves A at a speed of $2$ m$/$s what is its speed at B in m$/$s$?$