Part A

A discus thrower starts from rest and begins to

rotate with a constant angular acceleration of $2\mathrm{.}1$

$ra\frac{d}{s^2}.$

How many revolutions does it take for the discus thrower's angular speed to reach $5\mathrm{.}8ra\frac{d}{s}?$

Express your answer using two significant figures.

revolutions

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Part B

How much time does this take?

Express your answer using two significant figures.

$t=$