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A mass of 10 kg is suspended by a rope of length 4 m, from the ceiling. A force F is applied horizontally at the mid-point of the rope such that the top half of the rope makes an angle of 45o with the vertical. Then F equals.
(Take g = 10 ms-2 and the rope to be mass less)
(a) 90 N (b) 75 N (c) 70 N (d) 100 N
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