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Q.

A person pulls a block on a horizontal surface by applying a force of 5.0 N at an angle of 30O with the horizontal as shown in figure. Find the work done by this force in displacing the block through 2.0 m.

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a

10 J

b

103 J

c

5 J

d

53 J

answer is C.

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Detailed Solution

The work done by the force is

W=Fdcosθ

=(5.0 N)×(2.0 m)cos30°=(5.0 N)×(2.0 m)32=53 J

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