Use the following information to answer the next question Leany and Kyle measured the force needed to pull a block of wood across the tile floor in their Classroom in two trials. In the first trial, they pulled the block across the floor when the floor was dirty. Then they cleaned and waxed the floor before their second trial. Lenny and Kyle observed that the normal force . . and the coefficient of friction WILL Which of the following rows correctly completes the given statement changed changed B. changed stayed the same C. stayed the same changed 7JPG D. stayed the same stayed the same