A model of rocket is used to test materials that would be used to build the body of the extra rocket what is the limitation of this model? A. It is smaller than the actual rocket
B. It can be used to per deep out the materials why be affected by a rocket launch
C. It is less expensive than the actual rocket
D. It uses the materials that will be used on the extra rocket

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?