There is a question in Halliday/Resnick/Walker that I am using with my
high school class this year that bothers me and I wonder if someone
might help resolve it for me.
It shows a point object with a velocity vector pointing to the top of
the page and an acceleration vector pointing to the right side of the
page at a particular instant in time. It asks if the speed is increasing
or decreasing?
It seems that one would have such a situation on a projectile at the
peak of its vertical motion (turning the page by 90 degrees) and then
its speed would be increasing.
On the other hand it could be an object on the left side of a circular
motion motion in which case the acceleration could the the centripetal
acceleration and the speed constant.