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A bar of mass m is placed on the horizontal board. The board is slowly tilted. Determine the dependence of the friction force acting on the bar on the angle of inclination of the board Ξ±. Coefficient of friction Β΅.
The body is dropped over the slab at a height h from it. The slab moves vertically upwards at a speed of u.
Determine the time between two consecutive impacts of the body on the slab. The blows are absolutely
elastic
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