A positive charge particle of 100 mg is thrown in opposite direction to a uniform electric field of strength $1 \times 10^5 \mathrm{NC}^{-1}$. If the charge on the particle is $40 \mu \mathrm{C}$ and the initial velocity is $200 \mathrm{~ms}^{-1}$, how much distance it will travel before coming to the rest momentarily :