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$4.$ An $8kg$ point mass and a $15kg$ point mass are held in place $50cm$ apart. A particle of mass $m$ is released from a point between the two masses $20cm$ from the $8kg$ mass along the line connecting the two fixed masses. Find the magnitude and direction of the acceleration of the particle.

$2\mathrm{.}2{10}^{-9}\frac{m}{s^2}$ towards the $15kg$ mass

$4\mathrm{.}3{10}^{-9}\frac{m}{s^2}$ towards the $15kg$ mass

$4\mathrm{.}3{10}^{-9}\frac{m}{s^2}$ towards the $8kg$ mass

$2\mathrm{.}2{10}^{-9}\frac{m}{s^2}$ towards the $8kg$ mass