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How much does the piece of wood shorten because of its being used for this purpose?

A packing case weighing 100 kN is unloaded on a ramp making an angle of 30. The static coefficient of friction between box and ramp is 0.2. To keep the

box from sliding down the ramp a 5*5 cm piece of wood is placed between the case and the ramp as shown. How much does the piece of wood shorten because of its being used for this purpose?

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