If a close coiled helical spring absorbs 30 N-mm of energy while extending by 5 mm, its stiffness will be ______.

If a close coiled helical spring absorbs 30 N-mm of energy while exten

1.	If a close coiled helical spring absorbs 30 N-mm of energy while extending by 5 mm, its stiffness will be ______.
A.	2 N/mm
B.	4 N/mm
C.	2.4 N/mm
D.	10 N/mm
Answer» D. 10 N/mm

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If a close coiled helical spring absorbs 30 N-mm of energy while extending by 5 mm, its stiffness will be ______.

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