Hello,Originally Posted by Hallah
a) The average speed is:
b) The velocity is:
So v(2.5) = 472.5 m/h
c) You get the maximum velocity if
So you get t = -4.
As I've commented on your other post (concerning the same ghost train) the given function cann't be correct, because this train accelerates all the time. In my opinion a train should reach a constant speed pretty soon and hold it during the whole trip.
So please, check the text of your problem.