As you walk down a path, what best explains what prevents you from sinking into the ground?
a the force of gravity
b the speed at which you walk
c the force that your feet exert against the ground
d the force that the ground exerts against your feet

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?