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Four equal masses (each of mass M) are p...

Four equal masses (each of mass M) are placed at the corners of a square of side a. The escape velocity of a body from the centre O of the square is

A

`4sqrt((2GM)/a`

B

`sqrt((8sqrt2GM)/a`

C

`(4GM)/a`

D

`sqrt((4sqrt2GM)/a`

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