Question

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01:56
hr min
A force 7 - (3 +4j-k) N applied on an object which
displace the object from position 77 = (i + 2; + k) to
r2 = (31 +j+2). Calculate work done.
5 J
3 J
1J
4 J​

Answer 1

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