A car accelerates from rest at a constant rate of \( 2 \mathrm{~ms}^{-2} \) for some time. Then ...

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A car accelerates from rest at a constant rate of \( 2 \mathrm{~ms}^{-2} \) for some time. Then it retards at a constant rate of \( 4 \mathrm{~ms}^{-2} \) and comes to rest. It remains in motion for \( 6 \mathrm{~s} \).
(1) Its maximum speed is \( 8 \mathrm{~m} \mathrm{~s}^{-1} \)
(2) Its maximum speed is \( 6 \mathrm{~m} \mathrm{~s}^{-1} \)
(3) It travelled a total distance of \( 24 \mathrm{~m} \).
(4) It travelled a total distance of \( 18 \mathrm{~m} \).
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