A ball of mass m = 2.60 kg, starting from rest, falls a vertical distance = 55.0 cm before striking a vertical coiled spring, which it compresses an amount Y = 15.0 cm (Fig. 8-13). Deter mine the spring stiffness constant of the spring. Assume the spring has negligible mass, and ignore air resistance. Measure all distances from the point where the ball first touches the uncompressed spring (y = 0 at this point).