Question: A mass ( 2 0 kg ) rests on a surface ( u static = 0 . 4 ) connected by a cord to a

A mass (20 kg) rests on a surface (u static =0.4) connected by a cord to a hanging mass of 0.4 kg. The connecting cordis mass-less and stretch-free. The pulley is mass-less and frictionless. What is the force of friction on the heavier mass?

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