In this question, a statement of assertion 
is followed by a statement of reason 
. Mark the correct choice as:
Assertion: A person standing on a rotating platform suddenly stretched his arms, the platform slows down,
Reason: A person by stretching his arms increases the moment of inertia and decreases angular velocity.
Text Solution
Verified by ExpertsThe correct answer is:
A
: On stretching arms, his moment of inertia ( 
) increases. As no torque has been applied,
therefore, from conservation of angular momentum, 
constant. As 
increases, 
decreases, i.e., the platform slows down.
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