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A mass of M kg is suspended by a weightl...

A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of `45^@` with the initial vertical direction is

A

`(Mg)/sqrt2`

B

`(sqrt2-1)Mg`

C

`(sqrt2 +1) Mg`

D

`sqrt2 Mg`

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