a spark timer drop a insulated bob 1/60th second creating tick marks on the tape

Question

a spark timer drop a insulated bob 1/60th second creating tick marks on the tape, Determine the result for gravity from yi and y1
(Yi is measured from top spot to individual spot, while y1 is measure the distance between 2 mark). Which is more accurate? which is more precise? Why?

Calculate Measurement Data Spot Total Distance Total Distance Elapse Time Awg Velocity Instantaneous from top spot between Velocity Adjacent Points on tap sec Displacement Distance Elapse Time Interval Time 1 16 0.016 200 119 3.5 4 24 150 0.0S3 169 6 13.S 30 0.100 206 16.8 0.116 37 0.133 310 21 20.6 9 24.3 41 0.150 34 16 10 2S.4 0.166 32.7 0.183 4.6 12 37.3 49 0216 301 13 42.2 02 14 47.3 52.7 5.4 439 16 5S.4 17 64 6.0 023 45 70.6 19 771 65 036 425 20 83.9 21 91.0 22 9S.3

Explanation / Answer

Here, yi =   1/2gt2

               =   1/2 * 9.8 * (1/60)2

               =   1.36 ms

y1   = 1/2 * 9.8 * 0.0162

         = 1.2544 ms

Thus, Yi is more accurate .

   y1 is more precise .

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