i would have preferred to do astro ... but at our school only q2q was favoured.
i have a personal interest in astro, however q2q was kinda boring in my opinion ... =/ ... going on about emission/absorption crap ... ><
escape and orbital velocity arnt given.
you need to know how to derive them i guess ...
esc => kinetic energy and change in graviational potential energy
orb => centripital force and universal law of graviation
just an example on how they expect you to manipulate some of the formulae...