Subject: Interesting Date: Sat, 04 Jul 1998 11:57:20 -0700 From: Daniel Murphy <gecko@budsters.com> To: hwang@phy03.phy.ntnu.edu.tw I'm a student at Olympic College in Bremerton, Washington currently enrolled in a physics class. We are studying vectors, freefall, velocity/acceleration and projectile motion. Your web page is great! I think the answer to the question of case one about the green circle is the arc of zero vertical velocity. When the object reaches zero velocity, acceleration remains a constant 9.8 m/s(sq) downward. Dan