A point starts moving in a straight line with a certain acceleration. At a time \( t \) after be...

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A point starts moving in a straight line with a certain acceleration. At a time \( t \) after beginning of motion the
\( \mathrm{P} \) acceleration suddenly becomes retardation of the same value. The time in which the point returns to the initial point is
(a) \( \sqrt{2 t} \)
(b) \( (2+\sqrt{2}) t \)
(c) \( \frac{t}{\sqrt{2}} \)
(d) Cannot be predicted unless acceleration is given
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