Find the average acceleration Find the average acceleration of the tip of the 2.4-cm long hour hand in the interval noon to 6pm. 
I found the average velocity is -2.2x10^6 but I'm not sure how to go about finding acceleration. If someone has a few minutes can we chat and you can explain the set up to me? 

Average velocity is displacement over time: in this case, $4.8$ cm in $6$ hours.
That won't help much with computing average acceleration.
Average acceleration is change in velocity over time. The speed of the tip of the hand doesn't
change, but between noon and $6$ pm its direction reverses. So the change in velocity is
equal to twice the speed. Divide by $6$ hours.
