at a construction site a crane raises two boxes on a plank,

at a construction site a crane raises two boxes on a plank,

at a construction site a crane raises two boxes on a plank, one box weighs 10 kg and the other weighs 20 kg and are the same size.
a) if the coefficient of static friction is 0.4 how would i calculate the angle at which the boxes begin to slide if the plank is tilted?
b) if the coefficient of kinetic friction is 0.3, how would i calculate how fast the the boxes will accelerate along the plank once they start to slide?

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