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An object of mass 10   kg is connected to the lower end of a massless string of length 4   m hanging from the ceiling. If a force F is applied horizontally at the mid-point of the string, the top half of the string makes an angle of 45 ° with the vertical, then the magnitude of F is

Options

  1. A75 N
  2. B90   N
  3. C100 N
  4. D70   N

Correct answer

C. 100 N

Step-by-step solution

T 2 = 100 T 2 = F F = 100 N

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