A coolie with a load on his head walking on a horizontal road. What is the work done against gravity?

By Team Aakash Byju's | 21st December 2022 Curved Dotted Line

Work done by a coolie, walking on a level road with a load on his head, on the load is zero.

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We know that, Work Done = Force × displacement Or

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If the displacement is along the horizontal direction as shown in the image, the force is a normal force which is equal to the product of mass and gravity.

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Since the angle between the force vector and displacement vector is 90, we can write-

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