A block of mass \( 200 \mathrm{~kg} \) is being pulled up by men on...

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A block of mass \( 200 \mathrm{~kg} \) is being pulled up by men on an inclined plane at an angle of \( 45^{\circ} \) as shown.
The coefficient of static friction is \( 0.5 \). Each man can only apply a maximum force of \( 500 \mathrm{~N} \). The number of men required for the block to just start moving up the plane is
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