A box of bananas weighing 40.0 Newton rests on a horizontal surface. The coefficient of static friction between the surface and the box is 0.40, and the coefficient of kinetic friction is 0.20.
a) If no horizontal force is applied to the box and the box is rest, find how large is the friction force exerted on the box?
b) Calculate the magnitude of the friction force if the monkey applies a horizontal force of 6.0 Newton to the box and the box is initially at rest?
c) Find what minimum horizontal force must the monkey apply to start the box in motion?
d) Find what minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has started? If the monkey applies a horizontal of 18.0, find what is the magnitude of the friction force? and find what is the box's acceleration?