In the Figure, Two Identical Springs Have Unstretched Lengths of 0.25

question 64

Multiple Choice

In the figure, two identical springs have unstretched lengths of 0.25 m and spring constants of 300 N/m. The springs are attached to a small cube and stretched to a length L of 0.36 m as in Figure A. An external force P pulls the cube a distance D = 0.020 m to the right and holds it there. (See Figure B.) The work done by the external force P in pulling the cube 0.020 m is closest to

• A) 0.12 J.
• B) 0.060 J.
• C) 6.0 J.
• D) 12 J.
• E) 0.80 J.

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