JEE Main 2020PhysicsWork Power EnergyHardNumerical

JEE Main 2020 — Work Power Energy Question with Solution

JEE Main 2020 (05 Sep Shift 2)

Question

A body of mass 2 kg is driven by an engine delivering a constant power of 1 J s-1. the body starts from rest and moves in a straight line. After 9 s, the body has moved a distance (in m)….

Enter your answer

Show full solutionCorrect answer: 18
Correct answer
18

Step-by-step explanation

Given,

Power delivered by the engine P=1 J s-1

Mass of the body is m= 2 kg 

Body starts from the rest, u=0

Using work energy Theorem, 

W=∆K=Pt

Pt=12mv2-0

Substitute the values in the above equation, we get
(1)t=12×2×v2
⇒v=t=dsdt
⇒∫0tds=∫09tdt

⇒s=93232=23×27

⇒s=18 m

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Work Power Energy chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2020, 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.