JEE Main 2021 — Rotational Motion Question with Solution
From: JEE Main 2021 (Online) 17th March Morning Shift
Question
The following bodies,
(1) a ring
(2) a disc
(3) a solid cylinder
(4) a solid sphere,
of same mass 'm' and radius 'R' are allowed to roll down without slipping simultaneously from the top of the inclined plane. The body which will reach first at the bottom of the inclined plane is ___________. [Mark the body as per their respective numbering given in the question]
(1) a ring
(2) a disc
(3) a solid cylinder
(4) a solid sphere,
of same mass 'm' and radius 'R' are allowed to roll down without slipping simultaneously from the top of the inclined plane. The body which will reach first at the bottom of the inclined plane is ___________. [Mark the body as per their respective numbering given in the question]
This question includes a diagram. The text above accompanies the figure.
Enter your answer
Show full solutionCorrect answer: 5
Correct answer
5
Step-by-step explanation
IR = mR2, aR = g sin/2
ID = , aD = g sin
ISC = , aSC = g sin
ISC = mR2, aSS = g sin
S = ut + at2,
t =
t
solid sphere will take minimum time.
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This is a previous-year question from JEE Main 2021, covering the Rotational Motion 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.