Rotational energy problem
First off, my problem likely lies with the fact that it is rotating instead of being translated like in regular translations (like a ball being thrown etc). I remember my teacher saying something of the sort and I checked my notes and it seems to be about moment of inertia which has me lost. I have a feeling that in the following my mistake lies with the initial kinetic energy.
Ok so what I did for (a) which gives me half the right answer is:
Ui = 0, Ki = 1/2 * m * v^2, Kf = 0, Uf = mgh
Ef = Ei
mgh = 1/2 * m * v^2
gh = 1/2 * v^2
h = (1/2 * v^2)/g
h = 1/2 * 1.2^2 / 9.8
h = 0.073469388
as for (b), it seems to be very similar.
Any help would be GREATLY appreciated!
Thanks in advance!