1. The problem statement, all variables and given/known data 1. A structure with weight of 100 kN and which has a natural period of 1 second. Compute the stiffness of the structure. The structure has 5% critical damping. The structure when at rest is subjected to a half sine wave loading having a magnitude of 10kN and lasting 2 seconds. Find the maximum displacement of the structure and the time at which it occurs. Take the acceleration of gravity as 10 m/sec2. 2. Repeat question 1 above using the approximate solution treating the impulse as a very short duration loading where the duration of the impulse is 0.1 seconds. 2. Relevant equations 3. The attempt at a solution I have no idea how to start, if someone can just give me steps to follow that would be appreciated.