Question 1 :
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. How much work do they do in just holding it? $(g=10 ms^{-2})$

Question 2 :
Let a constant force, F act on an object. Let the object be displaced through a distance, s in the direction of the force. Let W be the work done. So W = ?

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2e1f59b460d7261f64b.png' /> In the above fig. A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force. Let us take it that the force acts on the object through the displacement. What is the work done in this case?

Question 4 :
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.