A body starting from rest at t=0 moves a...

A body starting from rest at `t=0` moves along a straight line with a constant acceleration. At `t= 2s`, the body reverses its direction keeping the acceleration same. The body returns to the initial position at `t=t_0`, then `t_0` is

4 s

`(4 + 2sqrt2)s`

`(2 + 2sqrt2)s`

`(4 + 4sqrt2)s`

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