JEE Main 2020PhysicsGravitationHardMCQ

JEE Main 2020Gravitation Question with Solution

JEE Main 2020 (09 Jan Shift 1)

Question

A body A of mass m is moving in a circular orbit of radius R about a planet. Another body B of mass m2 collides with A with a velocity which is half v2 the instantaneous velocity v of A. The collision is completely inelastic. Then, the combined body:

Choose an option

Show full solutionCorrect option: D
Correct answer
Dstarts moving in an elliptical orbit around the planet

Step-by-step explanation

Conserving momentum
m2v2+mv=m+m2vf
vf=2mV4×3m2=5V6
vf<vorb=v thus the combined mass will go on to an elliptical path

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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.