Question

In an experiment to determine the acceleration due to gravity g, the formula used for the time period of a periodic motion is $T=2\mathrm{Ï€}\sqrt{\frac{7(\mathrm{R}-\mathrm{r})}{5\mathrm{g}}}.$The values of R and r are measured to be ($60Â\pm 1$) mm and ($10Â\pm 1$) mm, respectively. In five successive measurements, the time period is found to be 0.52 s, 0.56 s, 0.57 s, 0.54 s and 0.59 s. The least count of the watch used for the measurement of time period is 0.01 s. Which of the following statement(s) is(are) true?