A student stands on a balcony that is exactly 15.0 m above the ground and drops a small metal ball directly downward. She uses a stopwatch and repeats the timing three times, obtaining the following results:
Trial 1: 1.73 s Trial 2: 1.79 s Trial 3: 1.70 s
(i) For each trial, calculate a separate value of the acceleration due to gravity.
(ii) Determine the mean value of the acceleration due to gravity from the three trials.
(iii) Calculate the percentage error of the mean value when compared with the standard value 9.8 m s⁻².