Answer:
The angular velocity of the straight rod is 4.85 rad/s.
Step-by-step explanation:
Given that,
Initial angular velocity =9.7 rad/s
We need to calculate the initial moment of inertia of the rod
Using formula of moment of inertia


We need to calculate the final moment of inertia of the rod
Using formula of moment of inertia


We need to calculate the angular velocity of the straight rod
Using conservation of rotational kinetic energy

Put the value into the formula


Hence, The angular velocity of the straight rod is 4.85 rad/s.