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A merry-go-round is rotating at 90 revolutions per minute. What is the instantaneous speed of a child sitting at the outer edge, 2.5 m from the center of the merry-go-round?

A

$24 \space \frac {m}{s}$

B

$3.8 \space \frac {m}{s}$

C

$1400 \space \frac {m}{s}$

D

$230 \space \frac {m}{s}$

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