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Physics · 2014
JEE Main 2014 · 2014-04-06 Offline · Q5
When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = a x+ b x^2 where a and b are constants. The work done…
When a rubber-band is stretched by a distance $\displaystyle x$, it exerts a restoring force of magnitude $\displaystyle \mathrm{F}=\mathrm{a} x+\mathrm{b} x^2$ where a and b are constants. The work done in stretching the unstretched rubber-band by L is :
Official answer
(3)
$\displaystyle \frac{\mathrm{aL}^2}{2}+\frac{\mathrm{bL}^3}{3}$
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JEE Main 2014 Physics question, with the answer from NTA’s final answer key. Where our answers come from.