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Q.

A particle initially at rest starts moving with uniform acceleration. The ratio of distances covered by it in the first and in the first 3 seconds is:

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a

1:3

b

1:5

c

1:7

d

1:9

answer is D.

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Detailed Solution

s=ut + (1/2)at2

s1= (1/2)ax12 = 9/2

s3 = (1/2)a(3)2= 9x 9/2

s1:s3 =1:9

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