Mary applies a force of 78 N to push a box with an acceleration of 0.44 m/s force present between the floor and the box. . When she increases the pushing force to 87 N, the box's acceleration changes to 0.74 m/s . There is a constant friction (a) What is the mass of the box in kilograms? kg What is the coefficient of kinetic friction between the floor and the box? Mary applies a force of 78 N to push a box with an acceleration of 0.44 m/s force present between the floor and the box. . When she increases the pushing force to 87 N, the box's acceleration changes to 0.74 m/s . There is a constant friction (a) What is the mass of the box in kilograms? kg What is the coefficient of kinetic friction between the floor and the box?