A box with mass m = 1.5 kg rests on the surface of a bar. The coefficient of static friction between the box and the bar is _s = 0.67 and the coefficient of kinetic friction is _k = 0.31.

Part (a)Write an expression for F_m the minimum force required to produce movement of the box on the surface of the bar.

Part (b)Solve numerically for the magnitude of the force F_m in Newtons.

Part (c)Write an expression for a, the box's acceleration, after it begins moving. (Assume the minimum force, F_m, continues to be applied.)

Part (d)Solve numerically for the acceleration, a in m/s².