JEE Main 2019PhysicsWork Power EnergyEasyMCQ

JEE Main 2019 — Work Power Energy Question with Solution

JEE Main 2019 (10 Jan Shift 2)

Question

A particle which is experiencing a force, given by F→=3i^-12j^, undergoes a displacement of d→=4i^. If the particle had a kinetic energy of 3 J at the beginning of the displacement, what is its kinetic energy at the end of the displacement?
 

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Show full solutionCorrect option: B
Correct answer
B15 J.

Step-by-step explanation

Work done by the force,F→.s→=3i^+12j^⋅4i^=12 J

By work energy theorem, Wtotal=∆K

12 J=Kf-Ki12+Ki=Kf

∴Kf=12+3=15 J

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About this question

This is a previous-year question from JEE Main 2019, 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.