The engine of a vehicle can produce a maximum acceleration of \( 4 ...

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The engine of a vehicle can produce a maximum acceleration of \( 4 \mathrm{~ms}^{-2} \). Its brakes can produce a
\( \mathrm{P} \) maximum retardation of \( 6 \mathrm{~ms}^{-2} \). The minimum

W time in which it can cover a distance of \( 3 \mathrm{~km} \) is
(1) \( 30 \mathrm{~s} \)
(2) \( 40 \mathrm{~s} \)
(3) \( 50 \mathrm{~s} \)
(4) \( 60 \mathrm{~s} \)
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