ze wzoru wyznaczyć v W= hf-1/2mv²

[latex]W = E_{f} - E_{k}\\W = hcdot f - frac{mv^{2}}{2} |cdot2\\2W = 2hf-mv^{2}\\mv^2} = 2hf - 2W\\mv^{2} = 2(hf-W) /:m\\v^{2} = frac{2(hf-W)}{m} |sqrt}\\v = sqrt{frac{2(hf-W)}{m}}[/latex]