A chloride ion (Cl−\text{Cl}^-Cl−) is projected with a velocity v v\,v at an angle of 30∘ 30^\circ\,30∘ to the horizontal into a region of uniform electric field directed vertically downwards. The effect of gravity on the ion is negligible.
What is the direction of the acceleration of the chloride ion?
Vertically upwards
Vertically downwards
At 30∘30^\circ30∘ to the horizontal
At 60∘60^\circ60∘ to the horizontal