Question

A force F = (5i+3j+2k) N is applied over a particle which displaces it from it's origin to the point r= (2i -j ) m . the work done in the partical in joule is [AIEEE 2004] ​

Answer 1

Answer:

work = force × displacement

= 5i+3j+2k× 2i-j

= 10i-3j+2k J

Answer 2

Answer:

work=force . displacement

work=(5i+3j+2k).(2i-j)=10-3=7joule