A particle of mass 0.3 kg 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?
$15\,\,\,\,m/{s^2}$
$3\,\,\,m/{s^2}$
$10\,\,\,m/{s^2}$
$5\,\,\,m/{s^2}$
Solution
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