Question

A force starts acting on a spring block system. At a stretch when $x=\frac{mg}{k}$

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

$\text{At}x=\frac{mg}{k},F_s=kx=k\left(\frac{mg}{k}\right),F=mg\Rightarrow F_s=F_{ext}(atx=\frac{mg}{k})W_{ext}+W_{Fs}=\Delta K.E>0$