In loading a fish delivery truck, a person pushes a block of ice up a 20∘

In loading a fish delivery truck, a person pushes a block of ice up a 20∘ incline at constant speed. The push is 150 N in magnitude and parallel to the incline. The block has a mass of 35.0 kg.

(a) Is the incline frictionless?
(b) If not, what is the force of kinetic friction on the block of ice?