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Solve the following problem given below:

Problem: A playground merry-go-round is a dick of radius 4.0 m and mass 5.0x10² kg, initially stationary. If a child of mass 48 kg jumps tangentially and lands on the edge of the merry-go-round with a speed of 5.0 m/s,

Part A- what is the resulting angular velocity?

I known the correct answer but I need to know how to get that. Thanks in advance!

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