Two Blocks,A and B,are Being Pulled to the Right Along

question 50

Multiple Choice

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 the upper block,A?

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