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A block of mass m rests on a plane inclined an angle with the horizontal.
A spring with force constant k is attached to the block. The coefficient of static friction between the block and plane is  s. The spring
is pulled upward along the plane very slowly. (a) What is the extension of
the spring the instant the block begins to move? (b) The block stops
moving just as the extension of the contracting spring reaches zero. Express k (the kinetic coefficient of friction) in terms of s and .
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