A positive charge particle of 100 mg is thrown in opposite direction to a uniform electric field of strength 1 × 10^5 NC^-1. If the charge on the…

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