1.

A man drags a box of mass 20kg on a horizontal floor as shown in figure by a string which wakes an angle `45^(@)` with the horizontal. If man exerts a force `F=100sqrt(2)N` on string and dragged the for a distance 10m. Work done by man is, A. 800JB. `1000sqrt(2)J`C. `1000J`D. 200J

Answer» Work done by man `rArr(F cos 45^(@)).d`
=1000


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