A body moves for a total of nine second starting from rest with uniform acceleration and then wi...

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A body moves for a total of nine second starting from rest with uniform acceleration and then with uniform retardation, which is twice the value of acceleration and then stops. The duration of uniform acceleration
[RPMT 2005]
(a) \( 3 \mathrm{~s} \)
(b) \( 4.5 \mathrm{~s} \)
(c) \( 5 \mathrm{~s} \)
(d) \( 6 \mathrm{~s} \)
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