A block of mass m = 1 kg is carefully placed at the top of an inclined plane so that it does not move initially (the angle of the plane is 30 degrees, its length L = 10 m). The plane has friction: the static friction coefficient is the same as the kinetic friction coefficient, equal to 0.2. At half height of the plane there is a spring gun firmly attached. The spring constant is 10,000 N/m. If the block slides down, it will hit the spring until the block stops for an instant.

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