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A 5.1-m-diameter merry-go-round is initially turning with a 4.5 s period. It slows down and stops...

A 5.1-m-diameter merry-go-round is initially turning with a 4.5 s period. It slows down and stops in 21 s .

A: Before slowing, what is the speed of a child on the rim?

Express your answer to two significant figures and include the appropriate units.

v = ?

B: How many revolutions does the merry-go-round make as it stops?

Express your answer using two significant figures.

delta degree = ?
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