ii) A 4-kg precision instrument confined to move vertically is rigidly attached to a massless platform which is supported by four springs each with an elastic constant of 25 N/m (Figure QB2.2). The floor is subjected to a harmonic vertical acceleration y(t) = 0.16 sin(t) m/s. Mo (t) m Keq Figure QB2.2 Elastically supported instrument subjected to base acceleration a) i) Determine the steady-state amplitude of the relative displacement between the platform and the floor X, (w) when w = 3 rad/s 16 Marks] b) ii) Determine the steady-state amplitude of the force transmitted to the floor Fr(w) [4 Marks]