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A particle is projected from point A, th...

A particle is projected from point `A`, that is at a distance `4R` form the centre of the earth, with speed `V_(1)` in a direction making `30^(@)` with the line joining the centre of the earth and point `A`, as shown. Consider gravitational interaction only between these two. (Use `(GM)/R=6.4xx10^(7) m^(2)//s^(2)`). The speed `V_(1)` if particle pasess grazing the surface of the earth is

A

`4sqrt2"km s"^(-1)`

B

`3sqrt2"km s"^(-1)`

C

`6sqrt2"km s"^(-1)`

D

`5sqrt2"km s"^(-1)`

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A
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