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A block of mass m=10 ~kg is hanging over a frictionless light fixed pulley by an inextensible light rope. Initially the block is held at rest. The other end of the rope is now pulled by a constant force F in the vertically downward direction. The linear momentum of the block is seen to increase by 2 kgm / s in 1 s (in the first second). Therefore,

Options

  1. Athe tension in the rope is F
  2. Bthe tension in the rope is 3N
  3. Cthe work done by the tension on the block, in first second, is =19.8 ~J
  4. Dthe work done against the force of gravity, in first second, is =9.8 ~J

Correct answer

D. the work done against the force of gravity, in first second, is =9.8 ~J

Step-by-step solution

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