when you drop a pebble from height h, it reaches the ground with kinetic energy k if there is no air resistance. from what height

From the initial height h

Explanation:

When a material or substance is drop from a height h, it possesses potential energy, immediately it is dropped from that height, the potential energy is gradually converted to kinetic energy, it gets to a point where the potential energy equals the kinetic energy, as the material touches the ground, all potential energy has been converted to kinetic energy already

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

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