Acrate with mass m = 4.25 kg rests on the top of a counter. the coefficient of static friction between the crate and the counter is μs = 0.62 and the coefficient of kinetic friction is μk = 0.47.
(a) write an expression for fm the minimum force required to produce movement of the book on the top of the bar.
(b) solve numerically for the magnitude of the force fm in newtons.