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  4. A block of mass 2 kg is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F=40 N. The kinetic energy of the particle increase 40 J in a given interval of time. Then: (g=10 m / s 2)

Q. A block of mass is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force . The kinetic energy of the particle increase in a given interval of time. Then:

Work, Energy and Power Report Error

Solution:


Free body diagram of block is as shown in figure.
From work-energy theorem

or
Work done by gravity is
and work done by tension is

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