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:

The length of the chest-expander spring whe

1.	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
Answer» B. 1600 J

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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:

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