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Two bodies of masses $m_{1}$ and $m_{2}$ are attached to the ends of an inextensible string passing over a frictionless pulling such that both move vertically. The acceleration of the bodies is?
$\frac{[(m_{1} \times m_{2})}{(m_{1} +m_{2})]}g$
$\frac{[(m_{1} - m_{2})}{(m_{1} +m_{2})]}g$
$\frac{[(m_{1} + m_{2})}{(m_{1} - m_{2})]}g$
$\frac{[(2m_{1} m_{2})}{(m_{1} + m_{2})]}g$