JEE Main 2020 — Gravitation Question with Solution
From: JEE Main 2020 (Online) 6th September Evening Slot
Question
Two planets have masses M and 16 M and their radii are and 2, respectively. The separation
between the centres of the planets is 10. A body of mass m is fired from the surface of the larger
planet towards the smaller planet along the line joining their centres. For the body to be able to
reach at the surface of smaller planet, the minimum firing speed needed is :
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
Let at point P, net gravitational force = 0
x = 8a
By Conservation of Mechanical Energy,
Ui + Ki = Uf + Kf
+
= + 0
=
=
v = =
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Gravitation 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 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.