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The equation of motion of a spring-mass-damper system is given by $$\dfrac{d^2x}{dt^2}+3 \dfrac{dx}{dt} +9x = 10 \sin(5t)$$

The damping factor for the system is

  1. $0.25$
  2. $0.5$
  3. $2$
  4. $3$
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