?Identify the force present and explain whether work is being performed in the following cases: (a) You lift a pencil off the top of a desk.
Chapter 5, Problem 5.19(choose chapter or problem)
Identify the force present and explain whether work is being performed in the following cases:
(a) You lift a pencil off the top of a desk.
(b) A spring is compressed to half its normal length.
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