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Q.

A ladder of mass 10kg is lying on horizontal surface. A body of weight 200N is attached to one end of ladder. If length is 5m and its centre of mass is at a distance of 2m from one end, the total work done in lifting the ladder to vertical position is

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a

6000J

b

4000J

c

1000J

d

1200J

answer is D.

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Detailed Solution

W=Wload +Wbody W=mlghl+mbghbW=[10×10×2]+[200×5]W=200+1000⇒W=1200J
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A ladder of mass 10kg is lying on horizontal surface. A body of weight 200N is attached to one end of ladder. If length is 5m and its centre of mass is at a distance of 2m from one end, the total work done in lifting the ladder to vertical position is