JEE Main 2021PhysicsWork Power EnergyEasyMCQ

JEE Main 2021 — Work Power Energy Question with Solution

JEE Main 2021 (22 Jul Shift 1)

Question

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 work done by the porter in lowering the suitcase. (take g=9.8 ms-2 )

Choose an option

Show full solutionCorrect option: B
Correct answer
B-627.2 J

Step-by-step explanation

WPorter +Wmg=ΔK.E.=0
 WPorter =-Wmg=-mgh
=-80×9.8×.8=-627.2 J

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About this question

This is a previous-year question from JEE Main 2021, covering the Work Power Energy chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.