Question

A 20 kg sled rests on a horizontal surface. if it takes 75 N to start the sled in motion and 60 N to keep it moving at a constant speed, what are the coefficients of static and kinetic friction respectively?

explain please

Answer 1

F = mu m g
75 = mu (20)(9.8)
solve for static mu
60 = mu m g
60 = mu (20)(9.8)
solve for kinetic mu

Answer 2

thanks!