A spring \( 40 \mathrm{~mm} \) long is stretched by the application of a force. If \( 10 \mathrm...

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A spring \( 40 \mathrm{~mm} \) long is stretched by the application of a force. If \( 10 \mathrm{~N} \) force required to stretch the spring through 1 \( \mathrm{mm} \), then work done in stretching the spring through \( 40 \mathrm{~mm} \) is
[AIIMS 1998; AFMC 2000; JIPMER 2000]
(a) \( 84 \mathrm{~J} \)
(b) \( 68 \mathrm{~J} \)
(c) \( 23 \mathrm{~J} \)
(d) \( 8 \mathrm{~J} \)
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