A horizontal force of 50n pushes a 50kg block against a
"A horizontal force of 5.0N pushes a .50kg block against a vertical wall. the block is initially at rest. If mu s = .60 and mu k =.80 then the frictional force is?
A) 0
B) 4.9N
C) 3.0 N
D) 5.0N
E) 4.0N
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