A 40 N box is pulled across a grass area at a constant speed. A horizontal force of
28 N is exerted. What is the coefficient of
friction between the grass area and the box?

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Why does lightning travel from clouds to the ground?

Acar weighs 15,000 n, and its tires are inflated to a pressure of 190kpa. how large is the area of the car's tires that are in contact with the road?