Question: two masses are connected by a string which goes over an ideal pulley as shown in fig. block a has a mass of 3 kg

two masses are connected by a string which goes over an ideal pulley as shown in fig. block a has a mass of 3 kg and can slide along a rough plane inclined 30 degree to the horizontal. the coefficient of static friction between block a and the plane is 0.400. what mass should block b have in order to start block a sliding up the ramp?

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