A chain weighing 25 pounds per foot is hanging from the top of a 100-foot building, as shown in the figure. Find the work needed to pull the chain to the top of the building. 
Definitions:
Brain Seizure
A sudden, uncontrolled electrical disturbance in the brain, potentially causing changes in behavior, movements, feelings, and levels of consciousness.
Interpersonal Therapy
A form of psychotherapy that focuses on the relationships of the patient and the social roles in treating emotional distress.
Cognitive-behavioral Therapy
A form of psychotherapy that treats problems by modifying dysfunctional emotions, behaviors, and thoughts.
Integrative Behavioral
An approach in therapy that combines techniques from different therapeutic disciplines to tailor treatment to individual patient needs.
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