Physics-
General
Easy

Question

A block of mass m moving on the horizontal x-y plane having coefficient of friction mu. The particle has a velocity v subscript 0 end subscript stack i with hat on top and acceleration a subscript 0 end subscript stack j with hat on top Unit vector along the direction of friction force acting on the particle is

  1. negative stack i with hat on top    
  2. negative stack j with hat on top    
  3. plus stack j with hat on top    
  4. negative fraction numerator stack i with hat on top plus stack j with hat on top over denominator square root of 2 end fraction    

The correct answer is: negative stack i with hat on top

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