Medium
$A$ block of mass $m$ is hung vertically from an elastic thread of force constant $\frac{2mg}{a}$. Initially,the thread is at its natural length and the block is allowed to fall freely. The work done on the block by the Earth when it passes through the equilibrium position will be:
- Azero
- B$\frac{mga}{2}$
- C$mga$
- D$\frac{mga}{4}$
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