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A porter with a suitcase on his head is climbing up a flight of stairs with a uniform speed. The work done by the ‘weight of the suitcase’ on the suitcase is
  • a)
    positive
  • b)
    negative
  • c)
    zero
  • d)
    undefined
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A porter with a suitcase on his head is climbing up a flight of stairs...
Force and displacement are in the same direction. 
So, work done is positive.
This question is part of UPSC exam. View all Class 9 courses
Most Upvoted Answer
A porter with a suitcase on his head is climbing up a flight of stairs...
Porter on the suitcase is zero.

Work is defined as the product of force and displacement in the direction of the force. In this case, the porter is carrying the suitcase on his head while climbing up the stairs. The force exerted by the porter is in the upward direction, opposite to the direction of displacement. Therefore, the work done by the porter on the suitcase is zero.

This is because the work done is only considered when the force and displacement are in the same direction. In this situation, the force and displacement are perpendicular to each other, so the work done is zero.
Community Answer
A porter with a suitcase on his head is climbing up a flight of stairs...
Correct answer is option A positive
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A porter with a suitcase on his head is climbing up a flight of stairs with a uniform speed. The work done by the ‘weight of the suitcase’ on the suitcase isa)positiveb)negativec)zerod)undefinedCorrect answer is option 'A'. Can you explain this answer?
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