Multiple Choice
Two blocks rest on a horizontal frictionless surface as shown. The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks. A 30-N force is applied to the bottom block as suggested in the figure. 
-What is the force of static friction between the top and bottom blocks?
A) zero newtons
B) 10 N
C) 20 N
D) 25 N
E) 30 N
Correct Answer:
Verified
Correct Answer:
Verified
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