Which of the following statements regarding the damping force of a damped oscillator is $NOT$ correct?

What are damped oscillations? Discuss them using the illustration of a spring.

Which of the following figures represents damped harmonic motion?

If the amplitudes of a damped harmonic oscillator at times $t=0, t_1$ and $t_2$ are $A_0, A_1$ and $A_2$ respectively,then the amplitude of the oscillator at a time of $(t_1+t_2)$ is

$A$ block of mass $m$ is connected to a light spring of force constant $k$. The system is placed inside a damping medium of damping constant $b$. The instantaneous values of displacement,acceleration and energy of the block are $x, a$ and $E$ respectively. The initial amplitude of oscillation is $A$ and $\omega^{\prime}$ is the angular frequency of oscillations. The incorrect expression related to the damped oscillations is

$A$ pendulum with a time period of $1\, s$ is losing energy due to damping. At a certain time,its energy is $45\, J$. If after completing $15$ oscillations,its energy has become $15\, J$,its damping constant (in $s^{-1}$) is: