Answer:
The answer is A. Cementing...
Explanation:
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Answer:
The final velocity 
Explanation:
Given data
Mass of merry go round
= 120 kg
Radius = 1.8 m
Initial angular velocity
= 0.6 
Mass of boy
= 25 kg
We know that the final velocity is given by

Put all the values in above formula we get


This is the final velocity.