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