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A machine of 100 kg mass has 20 kg rotor with 0.5 mm eccentricity. The mounting springs have stiffness 85 kN/m and damping is negligible. If the operating speed is 20 $\pi$rad/s and the unit is constrained to move vertically, the dynamic amplitude of the machine will be 

         (a) 0.470 $\times$ 10–4 m          (b) 1.0 $\times$ 10–4 m

         (c) 1.270 $\times$ 10–4 m          (d) 2.540 $\times$ 10–4 m

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