JEE Main 2019PhysicsGravitationHardMCQ

JEE Main 2019 — Gravitation Question with Solution

JEE Main 2019 (08 Apr Shift 2)

Question

A rocket has to be launched from earth in such a way that it never returns. If E is the minimum energy delivered by the rocket launcher, what should be the minimum energy that the launcher should have, if the same rocket is to be launched from the surface of the moon? Assume that the density of the earth and the moon are equal and that the earth's volume is 64 times the volume of the moon.

Choose an option

Show full solutionCorrect option: D
Correct answer
DE16

Step-by-step explanation

Mearth=64 Mmoon and Rearth=4 Rmoon
Given: E=G MearthmRearth
Now, for the moon,

 E'=G MmmRm
=GMearth64 mRearth4=G Mearth m16 Rearth=E16

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About this question

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