Posted by smatha on .
A 100N mass on a horizontal table is connected to a 50.0N hanging mass over a
frictionless pulley. The two masses are moving at constant speed. What is the value of
the coefficient of kinetic friction between the table and the horizontal mass?

physics 
Elena,
0=Nm₁g => N = m₁g
0=TF(fr) => T=F(fr)=μN= μ•m₁g
0=Tm₂g => T= m₂g

μ•m₁g = m₂g
μ = m₂g/m₁g= 50/100 =0.5