Thanks to Newton, we now know that the time $$t$$ (expressed in seconds) that an object needs to fall to the ground from a height $$h$$ (expressed in meters) is given by the formula \[ \sqrt{\frac{2h}{g}}\,, \] where $$g$$ is the gravitational constant given by $$g$$ = 9.81 m/s².

Newton's appel

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