A long board of mass M lies on a smooth horizontal table. There is a block of mass m on the board. The coefficient of friction between the block and the board is μ. A force parallel to the board is applied to the block, depending on time according to the law F=at. Investigate the dependence of the projections on the horizontal axis of the accelerations of the block and board on the time of action of the force. Draw graphs of these dependencies.
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