JEE Main 2021 — Rotational Motion Question with Solution
From: JEE Main 2021 (Online) 16th March Evening Shift
Question
A solid disc of radius 'a' and mass 'm' rolls down without slipping on an inclined plane making an angle with the horizontal. The acceleration of the disc will be g sin where b is ____________. (Round off to the Nearest Integer) (g = acceleration due to gravity, = angle as shown in figure)
This question includes a diagram. The text above accompanies the figure.
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Show full solutionCorrect answer: 3
Correct answer
3
Step-by-step explanation
We know that, on an inclined plane
Acceleration,
[ For disc, ]
....... (i)
As per question, acceleration of the disc will be .
Comparing it with Eq. (i), we get
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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.