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Question

A body starting from rest moves with constant acceleration. The ratio of distance covered by the body during the 5th sec to that covered in 5 sec is

A
9/25
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B
3/5
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C
25/9
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D
1/25
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Solution

The correct option is A 9/25

Distance covered in 5th second

S5th=u+a2(2n1)=0+a2(2×51)=9a2

and distance covered in 5 second,

S5=ut+12at2=0+12×a×25=25 a2

S5thS5=925


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