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  • A porter lifts a 10 kg suitcase from the platform and places it on his head 3.0 m above the platform. Calculate the work done by the porter on the suitcase.

A porter lifts a 10 kg suitcase from the platform and places it on his head 3.0 m above the platform. Calculate the work done by the porter on the suitcase.

Option: 1

-294 J

 

 

 


Option: 2

-400 J

 

 


Option: 3

294 J

 

 


Option: 4

-280 J


Answers (1)

best_answer

The suitcase is on the platform with zero kinetic energy, and it returns to zero when placed on the head. The change in kinetic energy is zero, so the total work done on the suitcase is zero.

There are two forces acting on the suitcase, one is gravity and the other is the force applied by the porter. Thus, the work done by the porter and the work done by gravity is opposite. When the suitcase is lifted, the work done by gravity is

W =-m g h

      \\ =-(10)(9.8)(3) \\\\ =-294 J

The work done by the porter is 294 J.

Posted by

Kuldeep Maurya

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