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A point mass starts moving in a straight...

A point mass starts moving in a straight line with a constant acceleration a. At a time `t_(1)` a fter the beginning of motion, the acceleration changes sign, remaining the same in magnitude. Determine the time t from the beginning of motion in which the point mass returns to the initial position.

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The correct Answer is:
`[t_(1)(2+sqrt(2))]`
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