Talk:Witching Hour Wake Up Call/@comment-25301067-20150221215231

Ok, since there isn't anything going on, who would want to help me on my math hw? (IM SORRY. ignore it if u want) >.<

an astronaut drops a rock off the edge of a cliff on the moon. The distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)=0.8t^2. What is the average speed, in meters per second, of the rock between 5 & 10 seconds after it was dropped?

A)12                                                              C)60

B)20                                                              D)80