Question

a body moves in a circular path of radius 20 cm if it completes two and half revolution along circular path find displacement of body please explain whole answer.

Answer 1

                                                 hiii
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here
          when the body completes first revolution then displacement of the body will be zero as it come back to the position from which it started. When it completes its second revolution then displacement of the body again will be zero as it  again come back to the position from which it started. So the displacement of the body in 2 revolution will be zero.
               Thus we have to calculate only half displacement that will have and that will be the displacement of 2 and half revolutions
 
              so,
                      displacement of body after covering the half distance=2r
                                                                                                   =2*20
                                                                                                    =40 cm
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