ST3.13 Box on rug

Graphic - No title - boxonrugb

A box sits on a rug on a horizontal frictionless floor. A horizontal force is applied to the right.

In case I it is applied to the rug. In case II it is applied to the box. In both cases the box and rug accelerate together.

What is the direction of the frictional force that the rug exerts on the box?

Incorrect
Incorrect
Correct
Incorrect
Incorrect

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