1} 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
(1) Mg (Ö2 - 1) (2) Mg (Ö2 + 1) (3) Mg Ö2 (4) Mg/Ö2
please answer with full explanation
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