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Q.

The relation between time t and distance x is t=αx2+βx Where αand β  are constants. The retardation is
 

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a

2βυ3

b

2β2υ3

c

2αυ3

d

2αβυ3

answer is A.

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Detailed Solution

t=αx2+βx dtdx=2αxdxdt+βdxdt 1=2αxv+βv 0=2αdxdtv+x.dvdt+βdvdt 0=2αv2+xa+βa 0=2αv2+2αxa+βa 0=2αv2+a2αx+β 0=2αv2+a2αx+β a=-2αv22αxβ a=2αv312αx+β=v a=2αv3    

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