When a body is lifted through a height h is the work its appears in the form of
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Answer:
The defination of work done (in physics) :
W=F⃗ .S⃗
Where F⃗ is the applied force on the object and S⃗ is the displacement of the object due to that force.
Now, the weight due to Earth's gravitational attraction acts downward and if we try to lift the object upward, we have to apply (upward) force against the gravitational attraction force. So, the F⃗ , in the defination of work done, is equal the weight of the body and its direction is upward.
By applying the upward force, the object is lifted at a height ‘h’. It means the displacement ( S⃗ ) in the work done expression is ‘h’, whose direction is also upward.
W=F⃗ .S⃗ and here both F⃗ and S⃗ is directed in the same direction (upward). So, the vector dot product gives simple multiplication of the magnitude of F⃗ and S⃗
So, Work done against the gravitational attraction to lift the object at a height ‘h’ = weight × height
Explanation:
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