Question

A force (3i +4j ) newton acts on a body and displaces it by (3i+4 j) metre. The work done by the force is:

Answer 1

Answer:

25J

Step-by-step explanation:

We know that work done by force to move a body to a distance is given by .

W= F.d

That is it is the dot product of the two vectors therefore the work done is given by

$w = (3i + 4j).(3i + 4j) \\ \\ = 3 \times 3 + 4 \times 4 \\ = 9 + 16 \\ 25 \: joules$

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