Answer:
Here \[k=15N{{m}^{-1}},\] \[x=20cm=0.20m,m=0.3kg\] \[F=-kx=15\times 0.20=-3N\] Acceleration, \[a=\frac{F}{m}=\frac{-3}{0.3}=-10\,m{{s}^{-2}}.\]
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