छोटे आयाम के साथ दोलन करने वाले एक साधारण लोलक (simple pendulum) का आवर्तकाल मुख्य रूप से किसके द्वारा निर्धारित होता है?

The total mechanical energy (sum of kinetic energy and potential energy) of a simple pendulum bob is 0.02 J. The speed of the bob at its equilibrium position is approximately: (Mass of the bob = 20 g)

Savitha, a Class XI student, while conducting an experiment to determine the effective length of a simple pendulum L, notes down the time taken to complete 30 oscillations as 60 s. What is the calculated effective length of the simple pendulum? (Take π2 = 9.8 and g = 9.8 m/s2)