JEE Main 2020 — Gravitation Question with Solution
From: JEE Main 2020 (Online) 3rd September Morning Slot
Question
A satellite is moving in a low nearly circular orbit around the earth. Its radius is roughly equal to
that of the earth’s radius Re
. By firing rockets attached to it, its speed is instantaneously increased
in the direction of its motion so that it become
times larger. Due to this the farthest distance
from the centre of the earth that the satellite reaches is R. Value of R is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B3Re
Step-by-step explanation
V0 =
Applying Conservation of Angular Momentum,
mVRe = mV'R
m = mV'R
V' =
Applying Conservation of Energy,
+ = +
+ = +
=
=
=
=
R = 3Re
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This is a previous-year question from JEE Main 2020, 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.