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Transcribed Image Text:4. A body of 1 kg with a horizontal speed v, gets the upper surface of the board of 2 kg
which has a rough horizontal surface and begins to slide along the
board. Will the board move? The coefficient of friction between
the body and the board u, between the board and the surface µ/4.
1). Yes
2). No
3). It depends on the speed v
4). The board will not move at first, and then it will start
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