Question

the force acting on an object is 5j+k and displacement of object 3i+4j. Then what is the component of force along displacement
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Answer 1

Explanation:

Answer

Correct option is

C

25J

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