A charged particle of mass ' $m$ ' and charge ' $q$ ' moving under the influence of uniform electric field Ei and a uniform magnetic field $\mathrm{B} \overrightarrow{\mathrm{k}}$ follows a trajectory from point $P$ to $Q$ as shown in figure. The velocities at $P$ and $Q$ are respectively, $v \vec{i}$ and $-2 v \vec{j}$. Then which of the following statements (A, B, C, D) are the correct?
(Trajectory shown is schematic and not to scale)