A particle having charge 10^-9 C moving in x-y plane in fields of 0.4 j N / C and 4 × 10^-3 k T experiences a force of (4 i +2 j ) × 10^-10 N. The…

A particle having charge $\displaystyle 10^{-9} \mathrm{C}$ moving in $\displaystyle x-y$ plane in fields of $\displaystyle 0.4 \hat{j} \mathrm{~N} / \mathrm{C}$ and $\displaystyle 4 \times 10^{-3} \hat{k} \mathrm{~T}$ experiences a force of $\displaystyle (4 \hat{i}+2 \hat{j}) \times 10^{-10} \mathrm{~N}$. The velocity of the particle at that instant is $\displaystyle \_\_\_\_$ m/s.