Review I Constants

A $4\mathrm{.}1-$m$-$diameter merry$-$go$-$round is rotating freely with an angular velocity of $0\mathrm{.}80ra\frac{d}{s}.$ Its total moment of inertia is $1380kg*m^2.$ Four people standing on the ground, each of mass $70$ kg $,$ suddenly step onto the edge of the merry$-$go$-$round.

Part A

What is the angular velocity of the merry$-$go$-$round now?

Express your answer using three significant figures.

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Part B

What if the people were on it initially and then jumped off in a radial direction $($relative to the merry$-$go$-$round$)?$

Express your answer using two significant figures.

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