JEE Main 2020 — Rotational Motion Question with Solution
From: JEE Main 2020 (Online) 8th January Morning Slot
Question
Consider a uniform rod of mass M = 4m and
length pivoted about its centre. A mass m
moving with velocity v making angle to
the rod's long axis collides with one end of the
rod and sticks to it. The angular speed of the
rod-mass system just after the collision is :
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
About hinge(O) net torque = 0
So angular momentum is conserved about hinge(O),
Linitial = Lfinal
m + 0 =
=
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This is a previous-year question from JEE Main 2020, 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.