nothing else if you can solve that would be great

Intro to Work Name 6. Karina pushed a 15-ke box across the floor at constant speed. She pushed the box 2.4 meters. if the coefficient of friction between the box and the floor was 0.62. how much work did friction do on the box? OPTIONAL EXTRA PRACTICE 7. CD LEVEL : Two students exert a force ol' 825 N pushing a car a distance ol' 35 m. a. How much work do the students do on the car? b. If the students applied twice as much force, how much work would they do pushing the car the same distance? 8. B LEVEL : A rope is used to pull a box a distance of 15.0 m across the floor. The rope is held at an angle of 46.( with the floor, and a force of 628 N is applied to the rope. How much work does the force on the rope do? 9. A LEVEL : A traveler carries a 215-N suitcase up the stairs, a displacement of 4.20 m vertically, and 4,60 m horizontally. How much work does the traveler do on the suiteuse