The equation of motion is damped harmonic oscillator is given by
x(t)=Ae^(-(bt)/(2m))cos(\omega t \phi _(0)). Find the expression of the instantaneous velocity of the oscillator, and then compute the value of the velocity at time 3.4 seconds, if the initial amplitude of the oscillator is 4.8 cm , the damping coefficient is
0.047k(g)/(s), its mass 737 g , angular frequency is
19ra(d)/(s)and initial phase is 0