In the Figure,two Identical Ideal Massless Springs Have Unstretched Lengths

question 918

Multiple Choice

In the figure,two identical ideal massless springs have unstretched lengths of 0.25 m and spring constants of 700 N/m.The springs are attached to a small cube and stretched to a length L of 0.30 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 external force P,that holds the cube in place in Figure B,is closest to

• A) 28 N.
• B) 25 N.
• C) 21 N.
• D) 18 N.
• E) 14 N.

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