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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-1)^th and the n^th second)
Initial velocity = u =0,

final velocity v=v m/sec,

Time of journey t=n sec,

Acceleration a = \frac{(v-u)}{t} =v/t msec^{-2}

Displacement S = ut + \frac{1}{2} at^2 = 0 (n)+1/2an2

S = 1/2an2

Time of journey t=(n-1)sec,

S =1/2a(n-1)2


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