Written Homework Problem: A team of dogs pulls a sled with a large box of food on it. The coefficient of kinetic friction between the sled and the snow is Nks. A) Draw separate, carefully labelled free-body diagrams for the sled and for the box (assume the box is not strapped down, and that air resistance is negligible). B) Suppose the sled has mass me and the box has mass ms, and that the coefficient of kinetic friction between the box and the sled is kb. Find an expression for the force from the dogs (Fdeas) needed to pull the sled at a constant speed with the box resting on top of it. Give your answer in terms of the given variables and, if necessary, g. C) Later, a person standing behind the sled grabs the box (applying only a horizontal force as they grab it) and holds it still so that the sled slides out from under it while remaining in contact with the box. What is the Fdeas needed to pull the sled at a constant speed now?