Question 1 Gwen exerts a 42-N horizontal force as she pulls a 56-N sled across a cement sidewalk at constant speed. What is the coefficient of kinetic friction between the sidewalk and the metal sled runners? Ignore air resistance. (Show all work, including formulas and units) 2 pts Question 2 2 pts Thomas sits on a small rug on a polished wooden floor. The coefficient of kinetic friction between the rug and the slippery wooden floor is only 0.16. If Thomas weighs 750 N, what horizontal force is needed to pull the rug and Thomas across the floor at a constant speed? (Show all work, including formulas and units) Question 3 2 pts A 5.0-kg block slides freely across a rough surface such that the block slows down with an acceleration of -2.45 m/s. What is the coefficient of kinetic friction between the block and the surface? (Show all work, including formulas and units) Question 4 2 pts At a wedding reception, you notice a boy who looks like his mass is about 30 kg running across the dance floor then sliding on his knees until he stops. If the kinetic coefficient of friction between the boy's pants and the floor is 0.20, what is the friction force acting on him as he slides? (Show all work, including formulas and units)