Recorded the duration for 10 oscillations.
Repeat step 4.2.4 to 4.2.5 for 5 times.
Increase distance x in step 4.2.2 for x=100 . Repeat steps4.2.3 to 4.2.6.
Increase distance x in step 4.2.2 for x=150 . Repeat steps4.2.3 to 4.2.6.
Added the mass in step 4.2.2 to 500 g, then repeat step 4.2.3 to 4.2.8