A 200-kg machine is attached to the end of a cantilever beam of length L = 2.5 m, elastic modulus E = 200 \times 10^9 N/m^2, and cross-sectional moment of inertia 1.8\times 10^–6 m^4. Assuming the mass of the beam is small compared to the mass of the machine, what is the stiffness of the beam?