A body constrained to move along the z-axis of a co-ordinate system, is subjected to a constant ...

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Question From - NCERT Physics Class 11 Chapter 06 Question – 024 WORK, ENERGY AND POWER CBSE, RBSE, UP, MP, BIHAR BOARD

QUESTION TEXT:-
A body constrained to move along the z-axis of a co-ordinate system, is subjected to a constant force `vec(F)` given by `vec(F)=-hat(i)+2hat(j)+3hat(k)` Newton where `hat(i),hat(j)`and `hat(k)` represent unit vectors along x-,y-,and z-axes of the system, respectively. Calculate the work done by this force in displacing the body through a distance of `4m` along the z-axis.

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Concept here is that other components are perpendicular to k' that's why work due to those forces automatically becomes zero !!

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