Áp dụng công thức tính sai số tỉ đối:
\(\delta v=\dfrac{\Delta v}{\overline{v}}=\dfrac{\Delta s}{\overline{s}}+\dfrac{\Delta t}{\overline{t}}=\dfrac{1}{798}+\dfrac{0,005}{0,404}=0,014\)
\(\delta g=\dfrac{\Delta g}{\overline{g}}=\dfrac{\Delta s}{\overline{s}}+2\dfrac{\Delta t}{\overline{t}}=\dfrac{1}{798}+2 \times \dfrac{0,005}{0,404}=0,026\)
\(\overline {v}=\dfrac{2 \overline{s}}{t}=\dfrac{2 \times 0,798}{0,404}=3,95(m/s)\)
\(\Delta v=\overline{v} \times \delta v=3,95 \times 0,014=0,06(m/s)\)
\(v=\overline {v} \pm \Delta v=3,95 \pm 0,06(m/s)\)
\(\overline{g}=\dfrac{2 \overline{s}}{{t^{-2}}}=\dfrac{2.0,798}{(0,404)^2}=9,78(m/s^2)\)
\(\Delta g=\overline{g} . \delta g=9,78.0,026=0,26(m/s^2)\)
\(g=\overline{g} \pm \Delta g=9,78 \pm 0,26(m/s^2).\)
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