# Minimum velocity

$$P$$ and $$Q$$ are two points a distance $$d$$ apart at heights $$h$$ and $$k$$ above a given horizontal plane. What is the minimum speed $$V$$ with which a particle can be projected from the horizontal plane so as to pass through $$P$$ and $$Q$$?

Clarification: the distance $$d$$ apart is the slanted, point-to-point, separation

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