Question

Q.30 A force acting on an object is given by F=(3i +4j - 6k)N and the displacement made by it is
given by r = (6i - 2j - k)m. calculate the work done.
OR​

Answer 1

Explanation:

ANSWER

Work=force∗displacement=(3i+4j)(3i+4j)=3∗3i.i+4∗4j.j+4∗3i.j+4∗3i∗j=9+16=25J

as,i.i=j.j=1;i.j=j.i=0