Answer:
(i) 5 N. Because before the applied maximum force to just move the block, the applied force has been exactly balanced by the force of friction which is acting at the interface of the block and the horizontal surface of the table. The block remains at rest. (1)
(ii) Kinetic friction comes In to play. It is because when the limiting friction is overcome by the applied force, the body begins to move and the limiting friction is converted into kinetic friction. (1)
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