Two blocks,A and B,are being pulled to the right along a horizontal surface by a horizontal 100 N pull,as shown in the figure.Both of them are moving together at a constant velocity of 2.0 m/s to the right,and both weigh the same.Which of the figures below shows a correct free-body diagram of the horizontal forces acting on upper block,A? 
Definitions:
Labor Demand Curve
A graphical representation showing the number of workers that businesses are willing and able to hire at different wage rates.
Marginal Expenditure Curve
A graph that shows the additional cost incurred by acquiring one more unit of a good or service.
Monopsony
A market situation in which there is only one buyer for a product or service, giving that buyer substantial power over prices.
Rightward Shift
A movement to the right on a graph, indicating an increase in quantity supplied or demanded at a given price.
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