A single-degree damped vibrating system consists of a suspended mass of 2.5 kg and spring constant 30 N/cm. The amplitude decreases to 25% of initial value after 4 oscillations. What will be the logarithmic decrement? [ Assume, e0.693 = 2]
1
0.4192
2
0.3721
3
0.2121
4
0.3465