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JEE Main2006PhysicsLaws of MotionActual

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

Options

  1. AM g( 2 -1)
  2. BM g( 2 +1)
  3. CM g 2
  4. DMg 2

Correct answer

A. M g( 2 -1)

Step-by-step solution

F 45=M g( - 45)F=M g( 2 -1)

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