Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Two masses 400 g and 350 g are suspended from the ends of a light string passing over a heavy pulley of radius 2 cm . When released from rest the heavier mass is observed to fall 81 cm in 9 s . The rotational inertia of the pulley is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
From kinematics with 
and 
: 
.
For the pulley system, applying Newton's second law to both masses and torque equation:
.
Substituting values: 
gives 
.
Therefore 
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