a man is standing on a platform and holding the luggage on his head. what work is done?
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Explanation:
Until the load is overhead and the person is moving forward, the work done is zero for both the cases. This is because, work is defined as a scalar product(Dot product) of Force and Displacement. It can be represented by the following:
Work=Force*Displacement*cos(Angle between force and displacement)
In the present case as the angle is 90 degrees, and as cos(90)=0, the work done is zero.
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