Question 1140733
.
<pre>

The speed is the circumference divided by the time  


    {{{(pi*d)/0.8}}} cm/s = {{{(3.14*80)/0.8}}} = 314 cm/s = 3.14 m/s.     <U>ANSWER</U>
</pre>

-----------


By the way, the problem has no any relation to Sinusoidal functions.