How to find work done by load

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

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?