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Work done in stretching chest – expander spring

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asked in Engg-mechanics by (215k points)
The length of the chest – expander spring when it is unstretched is 0.6 m and its stiffness is

10 N/mm. The work done in stretching it to 1 m will be

(a) 800 J       (b) 1600 J       (c) 3200 J       (d) 6400 J

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