Given, mass block, m=1kg Initial amplitude, A0=12cm Final amplitude, A=6cm The time taken to reduce the amplitude, t=2min=120s Using the expression of damped oscillation, A=A0e−‌
b
2m
t Substituting the values in the above equation, we get 6=12e−‌
b(120)
2(1)
⇒‌‌e60b=2 or 60b=10‌log‌2 ⇒‌‌b=‌