# A particle of mass $0.3 \;kg$ is subjected to a force $F = -kx$ with $k = 15\; N/m$. What will be its initial acceleration, if it is released from a point 20 cm away from the origin ?
( A ) $10\;m/s^2$
( B ) $5\;m/s^2$
( C ) $15\;m/s^2$
( D ) $3\;m/s^2$