Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • 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.<st

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

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main Maths 2025: Five tips to score high marks in ‘toughest’ subject; most important chapters
anam-khan

JEE Main 2025 exam city intimation slip for session 1 soon at jeemain.nta.nic.in
anam-khan

Focus on modern physics, formulas to solve tricky problems; 5 tips to tackle JEE Main physics 2025

Latest Question