Question

find the work done by the f=3i+2j-k displacing particle from a(1,-1,2) to b (5,3,1)

Answer 1

Work done by the force is given by  W=F.x

∴ W=(3  i^−2  j^+2  k^).(3  i^+2  j^+  k^)

Or  W=(3×3)+(−2×2)+(2×1)

Or  W=9−4+2=7 J