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  4. A ladder 2.5 m long and 150 N weight has Us centre of gravity l m from the bottom. A weight 40 N is attached to the Top end. The work required to raise the ladder from the horizontal position to the vertical position is:

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Q. A ladder 2.5 m long and 150 N weight has Us centre of gravity l m from the bottom. A weight 40 N is attached to the Top end. The work required to raise the ladder from the horizontal position to the vertical position is:

EAMCETEAMCET 1999

Solution:

The work required to raise the ladder from horizontal to vertical position is given by Work done, $ W=mg{{h}_{cm}}+mgh $ $ =150\times 1+40\times 2.5 $ $ =150\times 100=250\,J $