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Multiplication with Vectors

A lawn roller...

Question

A lawn roller is displaced through 1km using a force of 200N in a direction making an angle of $60^{0}$ with the lawn. The work done is

A

$10^{5} J$

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B

$10^{4} J$

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C

$10^{6} J$

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D

$10^{3} J$

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Solution

The correct option is A
$10^{5} J$

$W = F s c o s θ = 200 \times 1000 \times 1 / 2 = 10^{5} J$

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