JEE Main 2017PhysicsRotational MotionHardMCQ

JEE Main 2017 — Rotational Motion Question with Solution

JEE Main 2017 (08 Apr Online)

Question

A uniform disc of radius R and mass M is free to rotate only about its axis. A string is wrapped over its rim and a body of mass m is tied to the free end of the string as shown in the figure. The body is released from rest. Then the acceleration of the body is:

Choose an option

Show full solutionCorrect option: D
Correct answer
D2 mg2m+M

Step-by-step explanation

mg-T=ma

RT=Iα

RT=MR22 .aR

T=Ma2

mg-Ma2= ma

mg=aM2+m

mg=a M+2m2

a=2mgM+2m

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About this question

This is a previous-year question from JEE Main 2017, 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.