Force is 2i+3j has point of application moved from point A (1; 3) to point B (5;7) find work done .
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Answer:
20 J
to find displacement
final point-initial point
5i+7j -i-3j =4i+4j
then
work done = force.displacement
W = ( 2i+3j )(4i+4j). [used Dot product,]
=8+12
=20 J
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