3. A 100-kg box is sliding down a frictional surface at a constant speed of 0.2 m/s. Analyze the diagram and fill in the blanks. Which of the graphs represent this system? norm= frict = - N 30 gray 4. A 100-kg wooden box is accelerating down a wooden frictional incline. Analyze the diagram and fill in the blanks. The coefficient of friction is .25. Which graph below represents the motion of the system? Fnorm= frict = ...... ........ . . . ? ' . . . . ......... . . . . . . .. ........... 45" ....!. gray