JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 22 July 2021, Shift 2, Physics Q14

Question 14 of 90 in this shift, Physics question 14 of 30, Section A.

A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a distance of 80 cm with a constant velocity. Calculate the workdone by the porter in lowering the suitcase. (take

g = 9.8\ \mathrm{ms^{-2}}

)

(1) $784.0$ J
(2) $-62720.0$ J
(3) $-627.2$ JOfficial answer
(4) $+627.2$ J

Official answer

Option 3

NTA final key.

Chapter: Work, Energy and Power
Topic: Work and Kinetic Energy
Idea tested: Work Done by Gravity (Path Independence)

Same idea in other shifts

Asked 3× in all

5 Apr 2024, Shift 1 · Q34A body of mass 50 kg is lifted to a height of 20 m from the ground in the two different ways as shown in the figures. The ratio of work…EasyDiagram basedHas a figure
29 Jun 2022, Shift 2 · Q46In the given figure, the block of mass $m$ is dropped from the point ‘ $A$ ’. The expression for kinetic energy of block when it reaches…EasyDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.