A rope has a uniform mass density of 0.4 kg/m. The rope is 10 m long and is lowered into a 10 m deep pit. The bottom part of the rope just touches the bottom of the pit. What is the work done to pull the rope out of the well completely? (Assume g = 10m/s2)

Variable force is the force whose direction and amplitude vary during the body's motion and is not constant. Examples are spring force, magnetic force, electrostatic force, etc.