A pendulum is timed, first for 20 swings and then for 50 swings:
time for 20 swings = 17.4s
time for 50 swings = 43.2s
Calculate the average time per swing in each case. The answers are slightly different. Suggest some possible experimental reasons for this.

Case I:Average time per swing=17.420                                           =0.87 sCase II:Average time per swing=43.250                                           =0.864 sIn the second case, the average time is more accurate when compared tothe first case because of more number of observations.

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