Q111 Marks]: Consider a Four-story building with ground floor mass m₁ = 10000 Slugs while the mass of remaining floors is increased by 200 slugs as we go up from the ground floor to the top floor and restoring force between each story is k = 10000α lb/ft, a is any non zero digit of your registration number, respectively. What range of frequencies of an earthquake would place the building in danger of destruction.