If the cylinder is originally not rotating and the block is released from rest at a height 1.64 m above the ground, to what height will this mass rebound if it bounces straight back up from the floor

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?