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1 3 . 4 2 A plank A B of mass m is placed in a truck so that its lower end rests against a
A plank of mass is placed in a truck so that its lower end rests against a crate on the bed while its upper part rests against the top of the railing as shown. If the truck moves to the right with an acceleration a determine the maximum magnitude of a for which the plank will remain in contact with the top of the railing.
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