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A regular hexagon of side a=10sqrt(3)m i...

A regular hexagon of side `a=10sqrt(3)m` is kept at horizontal surface as shown in the figure. A particle is projected with velocity `Vm//s` at an angle `theta` from point `K` such that it will just touches the all four corners regular hexagon at `B`, `C`, `D` and `E` as shown in the figure. If `O` is the centre of hexagon and `x-`axis is parallel to horizontal and `y-`axis is perpendicular to `AF` and `CD` side of hexagon then answer the following [take `g=10m//s^(2)`]
The time required to move the particle from `D` to `E` is

A

`1 sec`

B

`1.3 sec`

C

`2 sec`

D

`2.5 sec`

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