Chapter 8, Prob. 53
A large fake cookie sliding on a horizontal surface is attached to one end of a horizontal spring with spring constant k = 400 N/m; the other end of the spring is fixed in place. The cookie has a kinetic energy of 20.0 J as it passes through the spring's equilibrium position.
Now what I am particularly wondering is why they are using a large fake cookie. It doesn't really make a lot of sense. Why didn't they use a real cookie? Or even all those balls and weights common to beginner's physic's problems? No, they had to use a cookie. And to make it worse, it was a fake cookie. I mean, they couldn't even eat it when the experiment was done.
Problem writers are really strange or have a weird sense of humor.