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A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is

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A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is

(a) 16 J

(b) 8 J

(c) 32 J

(d) 24 J

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Best answer

Correct Option  (b) 8 J

Explanation: 

The work done on the spring is stored as the PE of the body and is given by
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