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a particle starts from rest with uniform acceleration a and if velocity after n sec is v,then the displacement of body in last two second(i.e,the(n-10)^th and the n^th second)
We have ,
          Sn =u+(1/2)a(2n-1)
Here,
          u=0 m/s
Hence,
     S(n-10) = (1/2)a(2(n-10)-1)
                =(1/2)a(2n-21)
                =a(n-21/2) m
   Sn =(1/2)a(2n-1) m


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