a body of mass 25kg moving at 3ms-1 on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor calculate the coefficient of sliding friction (g=10.0ms-2

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?