# Projectile motion in electric field

In the above picture, a charged particle enters a uniform electric field at the point $$O$$ in the direction perpendicular to the electric field, and moves along the blue dotted projectile path $$O \rightarrow P \rightarrow Q \rightarrow$$. Now, suppose that it takes the same amount of time for the particle to move from $$O$$ to $$P$$ and from $$P$$ to $$Q.$$ Also suppose that the potential difference between $$O$$ and $$P$$ is $$V.$$ Then what is the potential difference between $$P$$ and $$Q?$$ (Ignore the gravitational force.)

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