Help me out solving these ques

Help me out solving these ques 12. 13. A cardboard board and its contents (total mass 30 kg) are pushed across a rough floor at a steady rate of 0.8 m s-l. When the box is no longer pushed, it comes to rest in a distance of 0.5 m. What frictional force acts on the box while it is being pushed? - 19.2 N) (Ans. A force F applied to an object of mass ml produces an acceleration of 3 m s-2. The same force applied to a second object of mass rn2 produces an acceleration of 1 m s-2. (a) What is the value of the ratio rn2 (b) If ml and are combined find their acceleration under the action of the force. (Ans. 1/3 , 0.750 m s-2)

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