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Question: Discuss whether any work is being done


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 chicken scratching the ground,
(b) A person studying,
(c) A crane lifting a bucket of concrete,
(d) The force of gravity on the bucket in part (c),
(e) The leg muscles of a person in the act of sitting down.

2.99

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