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How do I solve this problem that I got wrong? Mary applies a force of 78 N to push a box with an acceleration of

How do I solve this problem that I got wrong?
Mary applies a force of 78 N to push a box with an acceleration of 0.43 m/s When she increases the pushing force to 87 N, the box's acceleration changes to 0.58 m/s". There is a constant friction force present between the floor and the box. (a) What is the mass of the box in kilograms? kg (b) What is the coefficient of kinetic friction between the floor and the box

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