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Two weights \( W_{1} \) and \( W_{2} \) are suspended from the ends of a light string passing over a smooth fixed pulley. If the pulley is pulled up with acceleration \( g \), the tension in the string will be :
(A) \( \frac{4 W_{1} W_{2}}{W_{1}+W_{2}} \)
(B) \( \frac{2 W_{1} W_{2}}{W_{1}+W_{2}} \)
(C) \( \frac{W_{1}-W_{2}}{W_{1}+W_{2}} \)
(D) \( \frac{W_{1} W_{2}}{2\left(W_{1}+W_{2}\right)} \)
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