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A board is pushed horizontally over the top of a saw horse as shown in Figure 5. Determine if the saw horse will remain in its original position, slip or tip as the board is pushed forwards when d 4.2m. 5.4 m ? 0.5 0.9 m ? = 0.3 The board has a uniform weight of 50N/m and the saw horse a weight of 75N. The centre of gravity of the saw horse is at G and coefficients of static friction are as shown. 0.3 0.3 m 10.3 m Figure 5

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SoluHon u2m PX.

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