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49) A 2.0-kg box is pushed from rest by a person exerting a constant force of...

49) A 2.0-kg box is pushed from rest by a person exerting a constant force of 50 N. The person exerts this force
over a distance of 3.0 m before releasing the box and letting it slide to a stop. The coefficient of kinetic friction between the box and the floor is 0.15. (a) Draw a motion diagram showing the motion of the box from the moment the person begins pushing to the moment the box stops moving. (b) Represent the energy in the system consisting of the box and the floor at the following three points in time: (i) before the person starts pushing the box, (ii) immediately after the person stops exerting force on the box, and (iii) after the box comes to rest. (c) Determine the total increase in internal energy in the system.

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