Two students are pulling a 15 kg bag of volleyball equipment in the same direction one using 45 N and the other using 60 N of force. The friction force between the bag and the floor is 15 N. What is the net force acting on the bag?

Your vet has placed your pet on a diet. the diet is to contain at least 12 mg of fat and at least 14 mg of protein per serving. these requirements are to be obtained from two food sources. source a contains 2 mg of fat and 2 mg of protein per serving. source b contains 1 mg of fat and 3 mg of protein per serving. if source a sells for $1.28 per serving and source b sells for $1.12 per serving, how many servings of each type should be purchased to satisfy the requirements at minimal cost?