## Physics: Principles with Applications (7th Edition)

a. Percentage uncertainty = $\frac{0.2 s}{5.5 s} \times 100 \%=4 \%$ b. Percentage uncertainty = $\frac{0.2 s}{55 s} \times 100 \%=0.4 \%$ c. Percentage uncertainty = $\frac{0.2 s}{330 s} \times 100 \%=0.06 \%$