A basketball rolling with a velocity of 1.1 m/s undergoes an acceleration of -0.13 m/s2 and comes to a stop. How long did it take to come to a stop?

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?