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Please help me explain the answer for this question as soon as possible. Thank you so much! f61. A merrygoround has a radius of 2.0

Please help me explain the answer for this question as soon as possible. Thank you so much!

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\f61. A merrygoround has a radius of 2.0 m and a moment of inertia 300 kg - m2. A boy of mass 50 kg runs tangent to the rim at a speed of 4.0 m/s and jumps on. If the merrygoround is initially at rest, what is the angular velocity after the boy jumps on

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