Question: Discuss whether any work is being done by each of the following agents and, if so, whether the work is positive or negative: (a) A
(a) A chicken scratching the ground,
(b) A person studying,
(c) A crane lifting a bucket of concrete,
(d) The gravitational force on the bucket in part (c),
(e) The leg muscles of a person in the act of sitting down.
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