The work done by kinetic friction is:       A)  always negative   B)  always positive   C)  sometimes negative and sometimes positive   D)  always equal to the work done by the applied force   E)  zero

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The work done by kinetic friction is:
 

 

 

A) 

always negative
 

B) 

always positive
 

C) 

sometimes negative and sometimes positive
 

D) 

always equal to the work done by the applied force
 

E) 

zero
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