An electric motor is mounted at the end of a cantilever beam. The beam is observed to deflect by \(0.02 \mathrm{~m}\) when the motor runs at a speed of \(1500 \mathrm{rpm}\). By neglecting the mass and damping of the beam, determine the speed of the motor so that the dynamic amplification is less than \(10 \%\) about the static equilibrium value. Assume \(M=5 \mathrm{~kg}\) and \(k=30,000 \mathrm{~N} / \mathrm{m}\).