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A body has an initial velocity of \( 3 \mathrm{~ms}^{-1} \) and has an acceleration of \( 1 \mathrm{~ms}^{-2} \) normal to the direction of the initial velocity. Then its velocity \( 4 \mathrm{~s} \) after the start is
(1) \( 7 \mathrm{~m} \mathrm{~s}^{-1} \) along the direction of initial velocity
(2) \( 7 \mathrm{~ms}^{-1} \) along the normal to the direction of initial velocity.
(3) \( 7 \mathrm{~m} \mathrm{~s}^{-1} \) midway between the two directions
(4) \( 5 \mathrm{~m} \mathrm{~s}^{-1} \) at an angle \( \tan ^{-1}(4 / 3) \) with the direction of initial velocity.
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