JEE Main 2019 — Gravitation Question with Solution
From: JEE Main 2019 (Online) 12th April Evening Slot
Question
The ratio of the weights of a body on the Earth’s surface to that on the surface of a planets is 9 : 4. The mass
of the planet is
th of that of the Earth. If 'R' is the radius of the Earth, what is the radius of the planet ?
(Take the planets to have the same mass density)
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
W = mg
as m = constant everywhere
W g
=
We know,
= [Here RE = R ]
as m = constant everywhere
W g
=
We know,
= [Here RE = R ]
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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.