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Q.

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

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a

2αυ3

b

2βυ3

c

2αβυ3

d

2β2υ3

answer is A.

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Detailed Solution

t=αx2+βxdtdt=2αxdxdt+βdxdt1=2αxv+βv0=2αdxdtv+xdvdt+βdvdt0=2αv2+xa+βa0=2αv2+2αxa+βa0=2αv2+a(2αx+β)a=2αv22αx+βa=2αv312αx+β=va=2αv3

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