Hi guys. I have this homework question that I've been working on and I cannot even figure out where to start. Here goes: A 1.80-g particle is released from rest at point A on the inside of a smooth hemispherical bowl of radius R = 25.0 cm (figure below). Calculate the following: (a) Its gravitational potential energy at A relative to B. (b) Its kinetic energy at B. (c) Its speed at B. (d) Its potential energy at C relative to B. (e) Its kinetic energy at C. So far, I've only been able to calculate (d). I know what I have to do to calculate (a), and I know that (a) and (b) are equal since the bowl is smooth and frictionless. Here's my problem with (a). I know that PEg=mgy, but I can't figure out how to calculate y. I know it must be something blatantly obvious, but I've been doing physics all day now and I can't even think straight anymore. I don't need answers; I just need some help figuring out how to get y in (a). Thanks EDIT I just figured out a through d Mods please delete thread. I got it.