By pulling a on rope attached to a crate of mass 157.0 kg, the crate is dragged across a floor. Let the coefficient of static friction between the crate and the floor be 0.690 and the angle between the rope and horizontal is 37.6 °.
a)Find the minimum force required to move the crate.
b)At a later time the crate is now dragged with this same force, and has already started moving, on a wet floor where the kinetic friction coefficient is 0.414. What is the magnitude of the acceleration of the crate?