1.

Solve the problem of resonance damped vibration of a spring .If the governing D.E is given by (m frac{d^2 y}{dt^2} + c frac{dy}{dt} + ky=0; ) c>0 with initial conditions as y(0)=y0 and y (0)=y1 and assume c/m=2 , k/m= 2 and (v = sqrt{ ^2- ^2} ).

A. y = e<sup>- t</sup> (y<sub>0</sub> cos u2061vt + y<sub>1</sub> sin u2061vt)
B. y = e^(- t) (y<sub>0</sub> cos u2061vt+ ( left( frac{y_1+ y_0}{v} right) ) sin u2061vt)
C. y = e^(- t) ( ( left( frac{y_1+ y_0}{v} right) ) cos u2061vt + y<sub>0</sub> sin u2061vt)
D. y = e<sup>- t</sup> (y<sub>0</sub> cos u2061vt+ y<sub>1</sub> sin u2061vt)
Answer» C. y = e^(- t) ( ( left( frac{y_1+ y_0}{v} right) ) cos u2061vt + y<sub>0</sub> sin u2061vt)


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