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Q.

A particle is moving in a straight line under constant acceleration.  If the motion starts from rest, find the ratio of displacement in “n th" seconds to that in the n second

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a

n2

b

2n-1

c

( 2n-1)/n 2

d

n

answer is C.

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Detailed Solution

s =12 a n 2         s n = a(n-1 2)             s n =a(n-½)     (1)             s= ½ an 2          (2)   ∴ s n  /s  =      (2n-1)/ n 2
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