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A gardener pushes a wheelbarrow around the edges of a lawn. When she has finished, she is 5 m from her starting point. She has to pull upwards with a force of 300 N to lift the legs of the wheelbarrow off the ground. She pushes the wheelbarrow along the ground with a force of 100 N. Calculate how much work the gardener does in pushing the wheelbarrow around the lawn.

Respuesta :

Answer:

Work done by the gardner is 500 J

Explanation:

As we know that the gardner apply force perpendicular upward by magnitude 300 N and along the floor horizontal force is 100 N

so we have

[tex]F = 100 \hat i + 300 \hat j[/tex]

now the displacement of the gardner along the floor is

[tex]d = 5\hat i[/tex]

now work done is given as

[tex]W = F. d[/tex]

so we have

[tex]W = (100 \hat i + 300 \hat j). (5\hat i)[/tex]

[tex]W = 500 J[/tex]

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