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A block of mass m is at rest on a 20° slope. The coefficient of static friction between the box and the floor $\left( {{\mu _s}} \right)$ is 0.64. The block is connected by a massless string over a massless, frictionless pulley to a hanging block of mass 2.0 kg. What is the minimum mass m that will stick to the surface and not rise up the slope?

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