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Answer:follows are the solution to the given point:Explanation:In point A:The meet is next to the truck on the floor, and for Mary, its box is fixed wrt. Since no power occurs, no speed is going to be happening. So, Mary's box seems to be at rest.In point B:Chris and as well as the box ride mostly on the truck because the truck was accelerating, it has been said that Chris will be in a non-inert position mostly on the truck. For Chris, its box is thrown backward as well as the box is moved because of another force....