Work done by a force F on a body is W= F.S , where s is the displacement of body . given that under a force F= ( 2i+3j+4k)N a body is displaced from position vector r1= (2i+3j+k )m to position vector r2 =(i+j+k) m find the work done by this force
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Explanation:
W=force×displacement
w=(2j+3j+4k)N×(2i+3j+1k). :(k befor don't have number so k before 1)
w=N=(2j+3j+4k)×(2i+3j+1k)
2j+3j+4k÷2i+3j+1k=w=N
(2j,2i,3j,3i cancle so remain )
4k÷1k =4k
w= N =4k