A 5-kg sphere is dropped from a height of y = 2 m to test newly designed spring floors used in gymnastics. The mass of the floor section is 10 kg, and the effective stiffness of the floor is k = 120 kN/m. Knowing that the coefficient of restitution between the ball and the platform is 0.6, determine (a) the height h reached by the sphere after rebound, (b) the maximum force in the springs.
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