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Pythagoras Theorem

Work done in ...

Question

Work done in moving a $50 k g$ block through a horizontal distance of $10 m$ by applying a force of $100 N$ which makes an angle of $60^{\circ}$ with the horizontal is:

A

200 j o u l e s

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B

425 j o u l e s

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C

500 j o u l e s

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D

575 j o u l e s

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Solution

The correct option is C $500 j o u l e s$
$W o r k d o n e W = F d c o s θ$
$θ$ is the angle between force and displacement .
$W = 100 \times 10 cos (60) = 500 j o u l e s$

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