Physics 9702 · AS & A Level · Errors and uncertainties

Errors and uncertainties — practice question

To find the acceleration of free fall $g$, an experiment measures the time $t$ for a ball to drop a distance $s$. The percentage uncertainty in measuring $s$ is $2\%$. The percentage uncertainty in measuring $t$ is $3\%$. The value of $g$ is found from the equation below. $g = \frac{2s}{t^2}$ What is the percentage uncertainty in the value of $g$ that is calculated?

  • A$1\%$
  • B$5\%$
  • C$8\%$
  • D$11\%$

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