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Problems For Practice, , 1. Abob of simple pendulum of mass 1 8 is oscillating, with a frequency 5 vibrations per second and its, amplitude is 3.cm. Find the kinetic energy of the, bob in the lowest position. (Ans. 4441.5 erg), , _ A body weighing 10 g has a velocity of 6cm s7!, after one second of its starting from mean position., If the time period is 6 seconds, find the kinetic, energy, potential energy and the total energy...’ , (Ans. 180 erg, 540 erg, 720 erg), , . A particle executes SHM of period 8 seconds. After, what time of its passing through the mean position, will the energy be half kinetic and half potential ?, , [Chandigarh 08], (Ans. 1 s)