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**Unformatted text preview: **tches a spring 8 feet. The mass is
3
initially released from rest from a point 2 feet below the
equilibrium position, and the subsequent motion takes place in a
medium that oﬀers a damping force that is numerically equal to 1
2
the instantaneous velocity. Find the equation of motion if the mass
is driven by an external force equal to f (t ) = 10 cos 3t ....

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