Don't let it fall

Score: 2 Points




For the system consisting of two blocks shown, the minimum horizontal force F is applied so that the block B doesn’t fall under gravity. The masses of A and B are 15 kg and 9 kg respectively. The horizontal surface is frictionless and the coefficient of friction between the two blocks is 0.25. What is the magnitude of F?
$g=10m/s^2$

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