The force constant of a weightless spring is $16 \, N/m$. $A$ body of mass $1.0 \, kg$ suspended from it is pulled down through $5 \, cm$ and then released. The maximum kinetic energy of the system (spring + body) will be
- A$2 \times 10^{-2} \, J$
- B$4 \times 10^{-2} \, J$
- C$8 \times 10^{-2} \, J$
- D$16 \times 10^{-2} \, J$
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