Physics 9702 · AS & A Level · Errors and uncertainties

Errors and uncertainties — practice question

A steel ball is released and drops through a vertical distance $h$. The time $t$ for the drop is recorded using light gates. The data are shown in the table: $h = (4.05 \pm 0.01)\,\text{m}$, $t = (0.91 \pm 0.02)\,\text{s}$. The acceleration of free fall $g$ is determined from the equation shown below. $h = \frac{1}{2} g t^2$ What percentage uncertainty is there in the value of $g$?

  • A$2.4\%$
  • B$4.6\%$
  • C$5.1\%$
  • D$9.3\%$

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