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A box weighing 2000 N is to be slowly slid through 20 m on a straight track having friction

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A box weighing 2000 N is to be slowly slid through 20 m on a straight track having friction coefficient 0.2 with the box. (a) Find the work done by the person pulling the box with a chain at an angle θ with the horizontal. (b) Find the work when the person has chosen a value of θ which ensures him the minimum magnitude of the force.

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So, work done by the person, W = 

This is the correct answer

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